n. 25B6; adjective the main item : PRINCIPAL, chief, head, leading, foremost, most important, major, ruling, dominant, central, focal, key, prime, master, premier, primary, first, fundamental, supreme, predominant, (most) prominent, pre-eminent, paramount, overriding, cardinal, crucial, critical, pivotal, salient, elemental, essential, staple.
subsidiary, minor.
25B6; noun (poetic/literary) the Spanish Main : SEA, ocean, deep; informal, dated the drink; Brit. informal, dated the briny.
25A0; in the main . See mainly .