LIVELONG Meaning of LIVELONG in English 1. adj. poet. or rhet. in its entire length or apparently so (the livelong day). Etymology: ME lefe longe (as LIEF, LONG(1)): assim. to LIVE(1) 2. n. an orpine. Etymology: LIVE(1) + LONG(1) Oxford English vocab. Оксфордский английский словарь. 2012