aplomb

[ uh-plom, uh-pluhm ]
/ əˈplɒm, əˈplʌm /

noun

imperturbable self-possession, poise, or assurance.
the perpendicular, or vertical, position.

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Origin of aplomb

First recorded in 1820–30, aplomb is from the French word à plomb according to the plummet, i.e., straight up and down, vertical position
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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British Dictionary definitions for aplomb

aplomb
/ (əˈplɒm) /

noun

equanimity, self-confidence, or self-possession

Word Origin for aplomb

C18: from French: rectitude, uprightness, from à plomb according to the plumb line, vertically
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012