When something is true, legitimate or right, you can say it's correct, using the word as an adjective. It can also be a verb; to correct wrong answers is to adjust them to make them right.

The origin of correct can be found in the Latin word regere, "to guide," which became correctus as the past participle of corrigere, meaning "to straighten." When you correct your posture, you sit up straight. Sometimes when your cell phone tries to correct your spelling you can end up with some amusing sentences.

Definitions of correct
  1. adjective
    free from error; especially conforming to fact or truth
    “the correct answer”
    “the correct version”
    synonyms: right
    conforming exactly or almost exactly to fact or to a standard or performing with total accuracy
    accurate, exact, precise
    (of ideas, images, representations, expressions) characterized by perfect conformity to fact or truth ; strictly correct
    letter-perfect, word-perfect
    correct to the last detail; especially being in or following the exact words
    following a correct or logical method
    marked by suitability or rightness or appropriateness
    consistent with fact or reality; not false
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    incorrect, wrong
    not correct; not in conformity with fact or truth
    not exact
    containing or characterized by error
    based on an incorrect or misleading notion or information
    false, mistaken
    arising from error
    not suitable or right or appropriate
    not in accordance with the fact or reality or actuality
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  2. adjective
    in accord with accepted standards of usage or procedure
    synonyms: right
    marked by suitability or rightness or appropriateness
  3. adjective
    socially right or correct
    correct behavior”
    synonyms: right
    marked by suitability or rightness or appropriateness
  4. adjective
    correct in opinion or judgment
    synonyms: right
    disposed toward or having views based on what is right
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    based on or acting or judging in error
    obstinately perverse in judgment or opinion
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  5. verb
    make right or correct
    Correct the mistakes”
    synonyms: rectify, right
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    falsify knowingly
    amend, rectify, remediate, remedy, repair
    set straight or right
    locate and correct errors in a computer program code
    type of:
    change by reversal, reverse, turn
    change to the contrary
  6. verb
    alter or regulate so as to achieve accuracy or conform to a standard
    correct the alignment of the front wheels”
    synonyms: adjust, set
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    adjust in size relative to other things
    adjust the pitch, tone, or volume of
    adjust the pitch (of pianos)
    tune, tune up
    adjust the pitches of (musical instruments)
    calibrate, fine-tune, graduate
    make fine adjustments or divide into marked intervals for optimal measuring
    tune, tune up
    adjust for (better) functioning
    adjust so that a force is applied and an action occurs at the desired time
    adjust (sails on a ship) so that the wind is optimally used
    zero, zero in
    adjust (as by firing under test conditions) the zero of (a gun)
    adjust (an instrument or device) to zero value
    readjust, reset
    adjust again after an initial failure
    adjust or accustom to; bring into harmony with
    regulate or set the time of
    set to a certain position or cause to operate correctly
    modulate, regulate
    fix or adjust the time, amount, degree, or rate of
    focalise, focalize, focus, sharpen
    put (an image) into focus
    sync, synchronise, synchronize
    make synchronous and adjust in time or manner
    pressurise, pressurize
    increase the pressure in or of
    decompress, depressurise, depressurize
    decrease the pressure of
    fit, match
    make correspond or harmonize
    adjust with a plumb line so as to make vertical
    align, coordinate, ordinate
    bring (components or parts) into proper or desirable coordination correlation
    harmonise, harmonize, reconcile
    bring into consonance or accord
    linearise, linearize
    make linear or get into a linear form
    adjust the spaces between words
    accustom to urban ways
    carefully manipulate, adjust, or bring to a desired state
    set to zero
    fine-tune, tweak
    adjust finely
    put again into focus or focus more sharply
    adjust so as to be in a synchronized condition
    cause to lose air pressure or collapse by piercing
    scale down
    reduce proportionally
    scale up
    increase proportionally
    make fit for use
    align imperfectly or badly
    harmonize with or adjust to
    advance, set ahead
    move forward
    tune in
    regulate (a radio or television set) in order to receive a certain station or program
    balance, equilibrate, equilibrise, equilibrize
    bring into balance or equilibrium
    type of:
    alter, change, modify
    cause to change; make different; cause a transformation
  7. verb
    treat a defect
    “The new contact lenses will correct for his myopia”
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    type of:
    care for, treat
    provide treatment for
  8. verb
    adjust for
    “engineers will work to correct the effects or air resistance”
    synonyms: compensate, counterbalance, even off, even out, even up, make up
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    compensate for a weaker partner or member by one's own performance
    compensate, cover, overcompensate
    make up for shortcomings or a feeling of inferiority by exaggerating good qualities
    type of:
    balance, equilibrate, equilibrise, equilibrize
    bring into balance or equilibrium
  9. verb
    censure severely
    synonyms: castigate, chasten, chastise, objurgate
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    criticize harshly, usually via an electronic medium
    type of:
    bawl out, berate, call down, call on the carpet, chew out, chew up, chide, dress down, have words, jaw, lambast, lambaste, lecture, rag, rebuke, remonstrate, reprimand, reproof, scathe, scold, take to task, trounce, vituperate
    censure severely or angrily
  10. verb
    punish in order to gain control or enforce obedience
    synonyms: discipline, sort out
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    type of:
    penalise, penalize, punish, sanction
    impose a penalty on; inflict punishment on
  11. verb
    make reparations or amends for
    synonyms: compensate, redress, right
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    treat unjustly; do wrong to
    over-correct, overcompensate
    make excessive corrections for fear of making an error
    aby, abye, atone, expiate
    make amends for
    type of:
    alter, change, modify
    cause to change; make different; cause a transformation
  12. verb
    go down in value
    “the stock market corrected
    synonyms: decline, slump
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    type of:
    come down, descend, fall, go down
    move downward and lower, but not necessarily all the way
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