Definition of aspirate noun from the Oxford Advanced Learner's Dictionary

BrE BrE//ˈæspərət//
 
; NAmE NAmE//ˈæspərət//
 
(phonetics) the sound /h/, as in house The word ‘hour’ is pronounced without an initial aspirate. See related entries: Phonetics
Word Origin mid 16th cent. (as an adjective): from Latin aspiratus ‘breathed’, past participle of aspirare, from ad- ‘to’ + spirare ‘breathe’.
See the Oxford Advanced American Dictionary entry: aspirate

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