Meaning of BEST in English

[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"

Merriam-Webster English vocab.      Английский словарь Merriam Webster.