aplomb

[uh-plom, uh-pluhm]
noun
1.
imperturbable self-possession, poise, or assurance.
2.
the perpendicular, or vertical, position.

Origin:
1820–30; < French à plomb according to the plummet, i.e., straight up and down, vertical position


1. composure, equanimity, imperturbability.


1. confusion, discomposure; doubt, uncertainty.
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World English Dictionary
aplomb (əˈplɒm)
 
n
equanimity, self-confidence, or self-possession
 
[C18: from French: rectitude, uprightness, from à plomb according to the plumb line, vertically]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Dictionary.com's 21st Century Lexicon
Main Entry:  aplomb1
Part of Speech:  n
Definition:  great self-confidence; self-assuredness
Etymology:  Middle French a plomb 'according to the plummet'
Main Entry:  aplomb2
Part of Speech:  n
Definition:  perpendicularity
Etymology:  Middle French a plomb 'according to the plummet'
Dictionary.com's 21st Century Lexicon
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Etymonline
Word Origin & History

aplomb
"assurance, confidence," 1828, from Fr. aplomb (16c.), lit. "perpendicularity," from phrase à plomb "poised upright, balanced," lit. "on the plumb line," from L. plumbum "(the metal) lead" (see plumb), of which the weight at the end of the line was made.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They withstood the perspiration and the rough packing with aplomb.
But she may be the first to do it with such respect and aplomb.
He took the news with undeterred aplomb.
Try to handle these situations with courtesy and aplomb.
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