It is actually somewhat far more casual than important, especially when employed following a noun and linking verb: Velocity is key at this point. central (relatively formal) most critical: Although main and mane share pronunciation, their uses are very distinctive. Main features primarily as an adjective, creating importance or centrality https://mainshaftsleevebg0021381352851.glifeblog.com/35147829/not-known-factual-statements-about-main-shaft-sleeve-bg00213813