[best] adj, superlative of good [ME, fr. OE betst; akin to OE bot remedy--more at better] (bef. 12c) 1: excelling all others "the ~ student"
2: most productive of good or of advantage, utility, or satisfaction "what is the ~ thing to do"
3: most, largest "it rained for the ~ part of their vacation"
[2]best adv, superlative of well (bef. 12c) 1: in the best way: to greatest advantage "some things are ~ left unsaid"
2: most "those ~ able will provide needed support" [3]best n, pl best (bef. 12c) 1: the best state or part
2: one that is best "the ~ falls short"
3: the greatest degree of good or excellence
4: one's maximum effort "do your ~"
5: best clothes "Sunday ~" -- at best : under the most favorable circumstances [4]best vt (1863): to get the better of: outdo [5]best verbal auxiliary (1941): had best "you ~ listen"