Falsification is the act of deliberately lying about or misrepresenting something. If you write a note to your teacher excusing your absence the day before and claim it was written by your dad, that's falsification.

People commit falsification whenever they present something that's forged or altered so that its information is false. Changing your grades on your report card before your parents sign it is falsification — and likely to get you in big trouble! This noun comes from the verb falsify, "alter so as to mislead," from the Latin root falsus, "erroneous, mistaken, or false."

Definitions of falsification
  1. noun
    a willful perversion of facts
    synonyms: misrepresentation
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    distortion, overrefinement, straining, torture, twisting
    the act of distorting something so it seems to mean something it was not intended to mean
    equivocation, tergiversation
    falsification by means of vague or ambiguous language
    fabrication, lying, prevarication
    the deliberate act of deviating from the truth
    deceit, deception, dissembling, dissimulation
    the act of deceiving
    fibbing, paltering
    a trivial act of lying or being deliberately unclear
    the act of faking (or the product of faking)
    deceitful action that is not straightforward
    chicane, chicanery, guile, shenanigan, trickery, wile
    the use of tricks to deceive someone (usually to extract money from them)
    double-dealing, duplicity
    acting in bad faith; deception by pretending to entertain one set of intentions while acting under the influence of another
    cheat, cheating
    a deception for profit to yourself
    delusion, head game, illusion
    the act of deluding; deception by creating illusory ideas
    feigning, pretence, pretending, pretense, simulation
    the act of giving a false appearance
    impersonation, imposture
    pretending to be another person
    a deliberate act intended to make something obscure
    bluff, four flush
    the act of bluffing in poker; deception by a false show of confidence in the strength of your cards
    the act of taking in as by fooling or cheating or swindling someone
    type of:
    actus reus, misconduct, wrongdoing, wrongful conduct
    activity that transgresses moral or civil law
  2. noun
    the act of determining that something is false
    synonyms: disproof, falsifying, refutal, refutation
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    type of:
    determination, finding
    the act of determining the properties of something, usually by research or calculation
  3. noun
    any evidence that helps to establish the falsity of something
    synonyms: disproof, refutation
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    reductio, reductio ad absurdum
    (reduction to the absurd) a disproof by showing that the consequences of the proposition are absurd; or a proof of a proposition by showing that its negation leads to a contradiction
    evidence that refutes conclusively
    refutation by example
    type of:
    evidence, grounds
    your basis for belief or disbelief; knowledge on which to base belief
  4. noun
    the act of rendering something false as by fraudulent changes (of documents or measures etc.) or counterfeiting
    synonyms: falsehood
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    frame-up, setup
    an act that incriminates someone on a false charge
    falsification by the use of sophistry; misleading by means of specious fallacies
    criminal falsification by making or altering an instrument with intent to defraud
    type of:
    dishonesty, knavery
    lack of honesty; acts of lying or cheating or stealing
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