mainly◼◼◼(chiefly; for the most part) adverb [UK: ˈmeɪn.li] [US: ˈmeɪn.li]The Japanese live mainly on rice. = Les Japonais mangent principalement du riz.
primarily◼◼◼(of a primary or central nature) adverb [UK: ˈpraɪ.mə.rə.li] [US: praɪ.ˈme.rə.li]
predominantly◼◼◻(in a predominant manner) adverb [UK: prɪ.ˈdɒ.mɪ.nənt.li] [US: prə.ˈdɑː.mə.nənt.li]