Word Study
per annum
WORDNET DICTIONARY
Adverbial per annum has 1 sense
- per annum(r = adv.all) annually, each year, p.a., per year - 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"
For further exploring for "per annum" in Webster Dictionary Online