best friend

: superlative of good

: excelling all others

: most productive of good : offering or producing the greatest advantage, utility, or satisfaction

: superlative of well

: in the best (see ¹best) way : to greatest advantage

: most

: the best (see ¹best) state or part

: one that is best

: the greatest degree of good or excellence

: to get the better of : outdo

: had best (see ²best 1)

: one attached to another by affection or esteem

: acquaintance

: one that is not hostile

: to act as the friend of : befriend

: to include (someone) in a list of designated friends on a person's social networking site