per annum pe·ran·num uncommon adverb 1. by the year; every year (usually with reference to a sum of money paid or received) “he earned $100,000 per annum” “we issue six volumes per annum” Synonymsper annump.a.per yeareach yearannually WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
