adj. 25B6; adjective MOST IMPORTANT, of greatest/prime importance; uppermost, supreme, chief, overriding, predominant, foremost, prime, primary, principal, highest, main, key, central, leading, major, top; informal number-one.
PARAMOUNT
Meaning of PARAMOUNT in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012