Definition of per annum adverb from the Oxford Advanced Learner's Dictionary

 

per annum

 adverb
adverb
BrE BrE//pər ˈænəm//
 
; NAmE NAmE//pər ˈænəm//
 
(abbreviation p.a.)(from Latin)
 
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for each year earning £30 000 per annum Word Origin early 17th cent.: Latin.
See the Oxford Advanced American Dictionary entry: per annum