The noun impact can refer to a physical force (like a collision), an influence (a bad role model or a hero), or a strong effect (a foot of snow will have an impact on driving conditions).

Impact is used most often as a noun. A good teacher might have an impact (influence) on a struggling student. The moment two comets collide is called the "moment of impact." But this versatile word can also be used as a verb, though many people prefer to use its synonyms instead: "affect," "bear upon," or "touch on." Impacted teeth are wedged together or stuck behind each other.

Definitions of impact
  1. noun
    the striking of one body against another
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    blow, bump
    an impact (as from a collision)
    a forceful impact that makes a loud noise
    jar, jolt, jounce, shock
    a sudden jarring impact
    any violent blow
    rap, strike, tap
    a gentle blow
    bang, bash, belt, knock, smash
    a vigorous blow
    buffeting, pounding
    repeated heavy blows
    a glancing blow from or on the side of something (especially motor vehicles)
    slap, smack
    a blow from a flat object (as an open hand)
    type of:
    contact, impinging, striking
    the physical coming together of two or more things
  2. noun
    a forceful consequence; a strong effect
    “the book had an important impact on my thinking”
    synonyms: wallop
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    type of:
    consequence, effect, event, issue, outcome, result, upshot
    a phenomenon that follows and is caused by some previous phenomenon
  3. noun
    a strong influence
    synonyms: encroachment, impingement
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    type of:
    causing something without any direct or apparent effort
  4. noun
    the violent interaction of individuals or groups entering into combat
    synonyms: shock
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    type of:
    combat, fight, fighting, scrap
    the act of fighting; any contest or struggle
  5. verb
    press or wedge together; pack together
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    type of:
    force, squeeze, wedge
    squeeze like a wedge into a tight space
  6. verb
    have an effect upon
    synonyms: affect, bear on, bear upon, touch, touch on
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    strike a blow
    affect adversely
    cause repercussions; have an unwanted effect
    tell on
    produce an effect or strain on somebody
    have an effect for good or ill
    excite, stimulate
    act as a stimulant
    process, treat
    subject to a process or treatment, with the aim of readying for some purpose, improving, or remedying a condition
    hydrolise, hydrolize
    make a compound react with water and undergo hydrolysis
    color, colour, distort, tinge
    affect as in thought or feeling
    endanger, expose, peril, queer, scupper
    put in a dangerous, disadvantageous, or difficult position
    hit, strike
    affect or afflict suddenly, usually adversely
    cause to experience or suffer or make liable or vulnerable to
    bother, discommode, disoblige, incommode, inconvenience, put out, trouble
    to cause inconvenience or discomfort to
    act upon, influence, work
    have and exert influence or effect
    make a forceful move against
    cause to propagate, as by grafting or layering
    bacterise, bacterize
    subject to the action of bacteria
    iodise, iodize
    treat with iodine
    treat with nitric acid, so as to change an organic compound into a nitrate
    treat in a tank
    aerate, oxygenate, oxygenise, oxygenize
    impregnate, combine, or supply with oxygen
    mercerise, mercerize
    treat to strengthen and improve the luster
    treat with malt or malt extract
    fluoridate, fluoridise, fluoridize
    subject to fluoridation; treat with fluoride
    treat with creosote
    treat or combine with chlorine
    treat with carbon dioxide
    treat with camphor
    bromate, brominate
    treat with bromine
    treat with ammonia
    irradiate, ray
    expose to radiation
    treat with boiling water
    invigorate, quicken
    give life or energy to
    treat or prepare so as to put in a usable condition
    stimulate to action
    excite to some characteristic action or condition, such as motion, contraction, or nervous impulse, by the application of a stimulus
    nitrify, nitrogenise, nitrogenize
    treat with nitrogen or a nitrogen compound
    treat, process, heat, melt, or refine in a reverberatory furnace
    treat by incorporating fat
    sprinkle with silver iodide particles to disperse and cause rain
    treat with an agent; add (an agent) to
    sulfur, sulphur
    treat with sulphur in order to preserve
    vulcanise, vulcanize
    subject to vulcanization
    treat with a chromium compound
    bituminise, bituminize
    treat with bitumen
    Agenise, Agenize
    age or bleach flour with Agene (nitrogen trichloride)
    cause to perform
    treat (a chemical compound) with carboxyl or carboxylic acid
    convert into a simple soluble fermentable sugar by hydrolyzing a sugar derivative or complex carbohydrate
    process (ores or other raw materials), as by reduction
    prejudice, prepossess
    influence (somebody's) opinion in advance
    expose or make liable to danger, suspicion, or disrepute
    convert food into absorbable substances
    expose to the effects of vitriol or injure with vitriol
    cause (someone) to undergo something
    cause to experience shipwreck
    subject to refraction
    expose or make accessible to some action or influence
    expose to light, of photographic film
    fume, fumigate
    treat with fumes, expose to fumes, especially with the aim of disinfecting or eradicating pests
    control the humidity and temperature of
    form, imprint
    establish or impress firmly in the mind
    have force or influence; bring about an effect or change
    manipulate, pull strings, pull wires
    influence or control shrewdly or deviously
    color, colour
    modify or bias
    swing, swing over
    influence decisively
    blackjack, blackmail, pressure
    exert pressure on someone through threats
    carry, persuade, sway
    win approval or support for
    get at
    influence by corruption
    influence an event or its outcome by illegal means
    distress, straiten
    bring into difficulties or distress, especially financial hardship
    be in control
    make oneself subject to; bring upon oneself; become liable to
    type of:
    alter, change, modify
    cause to change; make different; cause a transformation
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