perjury
definition
the act of deliberately lying or making false statements under oath
example
The defendant was charged with perjury after it was discovered that he had lied under oath during the trial.
synonyms
false testimonylying under oathfalse swearing
word origin — From Middle English 'perjurie', from Old French 'perjurie', from Latin 'perjurium', meaning 'false oath', from 'per-' (through, utterly) + 'jurare' (to swear).