Etymology
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perjure (v.)

mid-15c. "swear falsely" (implied in perjured; late 13c. in Anglo-French), from Old French parjurer "to break one's word, renege on a promise" (11c.), from Latin periurare "to swear falsely, break one's oath," from per "away, entirely" (see per) + iurare "to swear" (see jury (n.)). Reflexive sense, "make (oneself) guilty by testifying falsely" is from 18c.

updated on April 08, 2020

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Definitions of perjure from WordNet

perjure (v.)
knowingly tell an untruth in a legal court and render oneself guilty of perjury;
From wordnet.princeton.edu, not affiliated with etymonline.