əˈpläm, -əm also -ōm or -ȯm; F ȧplōⁿ noun
( -s )
Etymology: French, literally, perpendicularity, from Middle French, from a plomb perpendicularly, literally, according to the plummet, from a to, at, according to (from Latin ad to, at) + plomb lead, plummet — more at at , plumb
1. : complete confidence or assurance in oneself : self-possession , poise
summed up the situation with his usual aplomb — John Marks
few of them, however, possess the aplomb to order a martini before lunch — Edward Newhouse
2. : the perpendicular position : perpendicularity
3. of a ballet dancer : the perfect equilibrium required to maintain stability in a pose or movement