annum

noun

(uncommon) A one-year period, particularly (finance) a fiscal year or (sciences) a Julian year of exactly 365.25 days.

I earn $50,000 per annum.

意味（1）

(uncommon) A one-year period, particularly (finance) a fiscal year or (sciences) a Julian year of exactly 365.25 days.

意味（2）

(uncommon, science fiction) A "year" determined by the revolution of an extraterrestrial planet.