Meaning of PRIME in English

n. 25B6; adjective

his prime reason for leaving : MAIN, chief, key, primary, central, principal, foremost, first, most important, paramount, major; informal number-one.

the prime cause of flooding : FUNDAMENTAL, basic, essential, primary, central.

prime agricultural land : TOP-QUALITY, top, best, first-class, first-rate, grade A, superior, supreme, choice, select, finest; excellent, superb, fine; informal tip-top, A1, top-notch.

a prime example : ARCHETYPAL, prototypical, typical, classic, excellent, characteristic, quintessential.

secondary, inferior.

25B6; noun he is in his prime : HEYDAY, best days/years, prime of one's life; youth, salad days; peak, pinnacle, high point/spot, zenith.

Concise Oxford thesaurus English vocabulary.      Краткий оксфордский словарь английского языка тезаурус.