WordReference Random House Learner's Dictionary of American English © 2026
fal•si•fy /ˈfɔlsəfaɪ/USA pronunciation
v. [~ + object], -fied, -fy•ing.
fal•si•fi•er, n. [countable]
WordReference Random House Unabridged Dictionary of American English © 2026- to make false or incorrect, esp. so as to deceive:to falsify income-tax reports.
- to fashion or alter fraudulently:He falsified the birthdate on his driver's license.
- to represent falsely:to falsify one's family history.
fal•si•fi•er, n. [countable]
fal•si•fy
(fôl′sə fī),USA pronunciation v., -fied, -fy•ing.
v.t.
v.i.
fal′si•fi′a•ble, adj.
fal′si•fi′a•bil′i•ty, n.
fal•si•fi•ca•tion
(fôl′sə fi kā′shən),USA pronunciation n.
fal′si•fi′er, n.
v.t.
- to make false or incorrect, esp. so as to deceive:to falsify income-tax reports.
- to alter fraudulently.
- to represent falsely:He falsified the history of his family to conceal his humble origins.
- to show or prove to be false; disprove:to falsify a theory.
v.i.
- to make false statements.
- Late Latin falsificāre. See false, -ify
- Middle French falsifier
- late Middle English falsifien 1400–50
fal′si•fi′a•bil′i•ty, n.
- 1. 3. See misrepresent. 4. rebut, discredit, refute, confute, controvert.