- superlative of well1.
noun(usually the best)
- (in sports) a record performance:a lifetime best of 12.0 secondsSee also personal best.
verb[with object] informal
Old English betest (adjective), betost, betst (adverb), of Germanic origin; related to Dutch and German best, also to better1
On the punctuation of best in compound adjectives, see well1 (usage).