Insert words into texts

• Make false by mutilation or addition
• As of a message or story
• The act of determining that something is false
• Prove false

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Falsify \Fal"si*fy\, v. t. [imp. & p. p. Falsified ; p. pr. & vb. n. Falsifying .] [L. falsus false + -ly: cf. F. falsifier. See False , a.] To make false; to represent falsely. The Irish bards use to forge and falsify everything as they list, to please ...

WordNet Word definitions in WordNet
n. the act of determining that something is false [syn: falsification , disproof , refutation ]

Wiktionary Word definitions in Wiktionary
vb. (present participle of falsify English)