falsification

UK: /ˌfɔːlsɪfɪˈkeɪʃ^ən/ US: /ˈfɔlsəfɪˈkeɪʃən/

WordReference Random House Learner's Dictionary of American English © 2025

fal•si•fy /ˈfɔlsəfaɪ/   v. [~ + object] , -fied, -fy•ing. 

1. to make false or incorrect, esp. so as to deceive:
   to falsify income-tax reports.
2. to fashion or alter fraudulently:
   He falsified the birthdate on his driver's license.
3. to represent falsely:
   to falsify one's family history.

fal•si•fi•ca•tion /ˈfɔlsəfɪˈkeɪʃən/  n. [countable* uncountable]
fal•si•fi•er, n. [countable]

WordReference Random House Unabridged Dictionary of American English © 2025

fal•si•fy  (fôl′sə fī), v., -fied, -fy•ing. 
v.t. 

1. to make false or incorrect, esp. so as to deceive:
   to falsify income-tax reports.
2. to alter fraudulently.
3. to represent falsely:
   He falsified the history of his family to conceal his humble origins.
4. to show or prove to be false; disprove:
   to falsify a theory.

v.i. 

5. to make false statements.

• Late Latin falsificāre. See false, -ify
• Middle French falsifier
• late Middle English falsifien 1400–50

fal′si•fi′a•ble, adj. 
fal′si•fi′a•bil′i•ty, n. 
fal•si•fi•ca•tion  (fôl′sə fi kā′shən), n.  fal′si•fi′er, n. 
Synonyms

• 1, 3. See misrepresent. 
• 4. rebut, discredit, refute, confute, controvert.