Plural of brevetcy; the state or rank of holding a brevet commission in the military.
From 'brevet' plus the suffix '-cy' (from Latin '-cia') used to denote a state or condition, with regular English pluralization.
This word is a perfect example of how English keeps stacking suffixes—we started with a French word 'brevet,' added '-cy' to make it a noun meaning the state of being, then added '-ies' to pluralize it!
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