n. 25B6; adjective MAIN, principal, chief, major, primary, leading, foremost, first, most important, predominant, dominant, (most) prominent, basic, standard, prime, premier; informal number-one.
STAPLE
Meaning of STAPLE in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012