A person's best performance at a task to date.

plural of level best

superlative form of well-grounded: most well-grounded

Used to express hopes that someone does well in an endeavour.

superlative form of well-intentioned: most well-intentioned

plural of best and fairest

(Australia, sports, rugby, Australian rules football) an award given to a player deemed to have been the best performer in a game or over a season

Used as a polite way to end a letter or see someone off.

Performing as well as one can.

(economics) Characterized by one or more optimality conditions not being satisfiable.