decrease

Decrease means to lower or go down. If you are driving above the speed limit, you should decrease your speed or risk getting a ticket. Students always want teachers to decrease the amount of homework.

The opposite of decrease is increase, which means to raise. In science, you often are measuring increases and decreases. Is there a decrease in the time it takes water to boil when you begin with water as a liquid rather than water in its ice-cube form?

Definitions of decrease
  1. noun
    a change downward
    “there was a decrease in his temperature as the fever subsided”
    synonyms: drop-off, lessening
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    Antonyms:
    increase
    a change resulting in an increase
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    shrinkage, shrinking
    process or result of becoming less or smaller
    casualty
    a decrease of military personnel or equipment
    sinking
    a slow fall or decline (as for lack of strength)
    attrition
    a wearing down to weaken or destroy
    dwindling, dwindling away
    a becoming gradually less
    waning
    a gradual decrease in magnitude or extent
    compression, condensation, contraction
    the process or result of becoming smaller or pressed together
    damage, equipment casualty
    loss of military equipment
    loss, personnel casualty
    military personnel lost by death or capture
    fading away
    gradually diminishing in brightness or loudness or strength
    type of:
    alteration, change, modification
    an event that occurs when something passes from one state or phase to another
  2. noun
    a process of becoming smaller or shorter
    synonyms: decrement
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    Antonyms:
    growth, increase, increment
    a process of becoming larger or longer or more numerous or more important
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    decay, decline
    a gradual decrease; as of stored charge or current
    decline, diminution
    change toward something smaller or lower
    desensitisation, desensitization
    the process of reducing sensitivity
    narrowing
    a decrease in width
    slippage
    a decrease of transmitted power in a mechanical system caused by slipping
    wastage
    the process of wasting
    declension, decline in quality, deterioration, worsening
    process of changing to an inferior state
    detumescence
    diminution of swelling; the subsidence of anything swollen
    ebb, ebbing, wane
    a gradual decline (in size or strength or power or number)
    erosion
    a gradual decline of something
    exponential decay, exponential return
    a decrease that follows an exponential function
    loss
    gradual decline in amount or activity
    nosedive
    a sudden sharp drop or rapid decline
    sinking spell
    a temporary decline in health or value
    slippage
    decline from a standard level of performance or achievement
    type of:
    physical process, process
    a sustained phenomenon or one marked by gradual changes through a series of states
  3. noun
    the amount by which something decreases
    synonyms: decrement
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    Antonyms:
    increase, increment
    the amount by which something increases
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    dip, drop, fall, free fall
    a sudden sharp decrease in some quantity
    shrinkage
    the amount by which something shrinks
    correction
    a drop in stock market activity or stock prices following a period of increases
    voltage drop
    a decrease in voltage along a conductor through which current is flowing
    type of:
    amount
    the relative magnitude of something with reference to a criterion
  4. noun
    the act of decreasing or reducing something
    synonyms: diminution, reduction, step-down
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    Antonyms:
    increase, step-up
    the act of increasing something
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    cut
    the act of reducing the amount or number
    mitigation, moderation
    the action of lessening in severity or intensity
    lowering
    the act of causing to become less
    cutback
    a reduction in quantity or rate
    devaluation
    the reduction of something's value or worth
    devitalisation, devitalization
    the act of reducing the vitality of something
    extenuation, mitigation, palliation
    to act in such a way as to cause an offense to seem less serious
    alleviation, easement, easing, relief
    the act of reducing something unpleasant (as pain or annoyance)
    de-escalation
    (war) a reduction in intensity (of a crisis or a war)
    minimisation, minimization
    the act of reducing something to the least possible amount or degree or position
    depletion
    the act of decreasing something markedly
    shortening
    act of decreasing in length
    shrinking
    the act of becoming less
    deduction, subtraction
    the act of subtracting (removing a part from the whole)
    deflation
    the act of letting the air out of something
    deduction, discount, price reduction
    the act of reducing the selling price of merchandise
    rollback
    reducing prices back to some earlier level
    weakening
    the act of reducing the strength of something
    depreciation
    a decrease in price or value
    contraction
    the act of decreasing (something) in size or volume or quantity or scope
    reverse split, reverse stock split, split down
    a decrease in the number of outstanding shares of a corporation without changing the shareholders' equity
    amortisation, amortization
    the reduction of the value of an asset by prorating its cost over a period of years
    declassification
    reduction or removal by the government of restrictions on a classified document or weapon
    shelter, tax shelter
    a way of organizing business to reduce the taxes it must pay on current earnings
    tax credit
    a direct reduction in tax liability (not dependent on the taxpayer's tax bracket)
    budget cut
    the act of reducing budgeted expenditures
    pay cut, salary cut
    the act of reducing a salary
    cost cutting
    the act of cutting costs
    price cut, price cutting
    cutting the price of merchandise to one lower than the usual or advertised price
    spending cut
    the act of reducing spending
    tax cut
    the act of reducing taxation
    tapering
    the act of gradually lowering the size or amount
    service cutback
    the act of reducing service
    evisceration
    altering something (as a legislative act or a statement) in such a manner as to reduce its value
    spasmolysis
    the relaxation or relief of muscle spasms
    detente
    the easing of tensions or strained relations (especially between nations)
    palliation
    easing the severity of a pain or a disease without removing the cause
    liberalisation, liberalization, relaxation
    the act of making less strict
    consumption, expenditure, using up
    the act of consuming something
    exhaustion
    the act of exhausting something entirely
    decompressing, decompression
    relieving pressure (especially bringing a compressed person gradually back to atmospheric pressure)
    abbreviation
    shortening something by omitting parts of it
    cut, cutting, cutting off
    the act of shortening something by chopping off the ends
    miniaturisation, miniaturization
    act of making on a greatly reduced scale
    bite
    a portion removed from the whole
    withholding
    the act of deducting from an employee's salary
    abatement
    the act of abating
    wilt, wilting
    causing to become limp or drooping
    dilution
    weakening (reducing the concentration) by the addition of water or a thinner
    etiolation
    the act of weakening by stunting the growth or development of something
    contraction, muscle contraction, muscular contraction
    (physiology) a shortening or tensing of a part or organ (especially of a muscle or muscle fiber)
    truncation
    the act of cutting short
    drain
    a gradual depletion of energy or resources
    tax avoidance
    the minimization of tax liability by lawful methods
    dilution
    the act of weakening the power, value, or content of something
    type of:
    change of magnitude
    the act of changing the amount or size of something
  5. verb
    decrease in size, extent, or range
    “The amount of homework decreased towards the end of the semester”
    synonyms: diminish, fall, lessen
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    Antonyms:
    increase
    become bigger or greater in amount
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    break
    diminish or discontinue abruptly
    shrink, shrivel
    decrease in size, range, or extent
    taper
    diminish gradually
    drop off
    fall or diminish
    fly, vanish, vaporize
    decrease rapidly and disappear
    break
    fall sharply
    ease off, ease up, flag, slacken off
    become less intense
    weaken
    become weaker
    boil down, concentrate, decoct, reduce
    be cooked until very little liquid is left
    contract, shrink
    become smaller or draw together
    shrink, shrivel, shrivel up, wither
    wither, as with a loss of moisture
    abate, die away, let up, slack, slack off
    become less in amount or intensity
    deflate
    become deflated or flaccid, as by losing air
    dwindle, dwindle away, dwindle down
    become smaller or lose substance
    remit
    diminish or abate
    de-escalate
    diminish in size, scope, or intensity
    depreciate, devaluate, devalue, undervalue
    lose in value
    shorten
    become short or shorter
    thin out
    become sparser
    decline, go down, wane
    grow smaller
    wane
    decrease in phase
    wane
    become smaller
    decelerate, retard, slow, slow down, slow up
    lose velocity; move more slowly
    decrescendo
    grow quieter
    atrophy
    undergo atrophy
    attenuate
    become weaker, in strength, value, or magnitude
    disappear, evaporate, melt
    become less intense and fade away gradually
    die down
    become progressively weaker
    collapse
    lose significance, effectiveness, or value
    fade, melt
    become less clearly visible or distinguishable; disappear gradually or seemingly
    lessen, subside
    wear off or die down
    blast
    shrivel or wither or mature imperfectly
    die back, die down
    suffer from a disease that kills shoots
    dry up, mummify
    dry up and shrivel due to complete loss of moisture
    blur, dim, slur
    become vague or indistinct
    languish, pine away, waste
    lose vigor, health, or flesh, as through grief
    dull
    make less lively or vigorous
    pall
    lose strength or effectiveness; become or appear boring, insipid, or tiresome (to)
    loose, loosen, relax
    become loose or looser or less tight
    slacken
    become looser or slack
    dip
    go down momentarily
    wear on
    pass slowly (of time)
    drop
    go down in value
    slack, slacken, slow, slow down, slow up
    become slow or slower
    slow, slow down, slow up
    cause to proceed more slowly
    delay, detain, hold up
    cause to be slowed down or delayed
    wilt
    lose strength
    flex
    contract
    type of:
    change magnitude
    change in size or magnitude
  6. verb
    make smaller
    “He decreased his staff”
    synonyms: lessen, minify
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    Antonyms:
    increase
    make bigger or more
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    suppress
    reduce the incidence or severity of or stop
    mitigate
    make less severe or harsh
    pare, pare down
    decrease gradually or bit by bit
    circumscribe, confine, limit
    restrict or confine
    boil down, concentrate, reduce
    cook until very little liquid is left
    reduce, shrink
    reduce in size; reduce physically
    abbreviate, abridge, contract, cut, foreshorten, reduce, shorten
    reduce in scope while retaining essential elements
    abate, slack, slake
    make less active or intense
    lour, lower, turn down
    make lower or quieter
    de-escalate, step down, weaken
    reduce the level or intensity or size or scope of
    minimise, minimize
    make small or insignificant
    bring down, cut, cut back, cut down, reduce, trim, trim back, trim down
    cut down on; make a reduction in
    cut
    have a reducing effect
    relax, slack, slack up, slacken
    make less active or fast
    belittle, diminish
    lessen the authority, dignity, or reputation of
    lighten, relieve
    alleviate or remove (pressure or stress) or make less oppressive
    bowdlerise, bowdlerize, castrate, expurgate, shorten
    edit by omitting or modifying parts considered indelicate
    hold down
    restrain
    keep down, number
    place a limit on the number of
    cap
    restrict the number or amount of
    curb, curtail, cut back, restrict
    place restrictions on
    reduce, scale down
    make smaller
    reef
    reduce (a sail) by taking in a reef
    miniaturise, miniaturize
    design or construct on a smaller scale
    concentrate, condense, digest
    make more concise
    shorten
    make shorter than originally intended; reduce or retrench in length or duration
    hedge
    minimize loss or risk
    spill
    reduce the pressure of wind on (a sail)
    quench
    reduce the degree of (luminescence or phosphorescence) in (excited molecules or a material) by adding a suitable substance
    retrench
    make a reduction, as in one's workforce
    slash
    cut drastically
    thin out
    make sparse
    thin
    make thin or thinner
    depopulate, desolate
    reduce in population
    detract, take away
    take away a part from; diminish
    deflate
    reduce or cut back the amount or availability of, creating a decline in value or prices
    inflate
    increase the amount or availability of, creating a rise in value
    downsize
    reduce in size or number
    downsize
    make in a smaller size
    subtract
    take off or away
    delimit, delimitate, demarcate
    set, mark, or draw the boundaries of something
    content
    satisfy in a limited way
    contract
    make smaller
    ration
    restrict the consumption of a relatively scarce commodity, as during war
    knock off, shave
    cut the price of
    type of:
    alter, change, modify
    cause to change; make different; cause a transformation
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