Etymology
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calibre (n.)

chiefly British English spelling of caliber (q.v.); for spelling, see -re.

updated on December 22, 2012

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Definitions of calibre from WordNet

calibre (n.)
a degree or grade of excellence or worth;
Synonyms: quality / caliber
calibre (n.)
diameter of a tube or gun barrel;
Synonyms: bore / gauge / caliber
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.