- The definition of aplomb is a strong belief in yourself and the ability to remain calm under pressure.
To know with certainty that you are the best person for the job and then to perform it well is an example of performing a job with aplomb.
aplomb definition by Webster's New World
Origin: French literally , perpendicularity, equilibrium ; from à, to plush plomb, the metal lead: see plumb
aplomb definition by American Heritage Dictionary
Origin: French, from Old French a plomb, perpendicularly : a, according to (from Latin ad-; see ad-) + plomb, lead weight (from Latin plumbum, lead).