annum

From Latin per annum (“yearly”), from annus (“year”).

annum (plural annums)

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

      Coordinate terms: biennium, triennium, quadrennium, quinquennium, sexennium, septennium, octennium, novennium, decennium, vicennium, tricennium, centennium, quincentennium, millennium, decamillennium, centimillennium, millionennium

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

Most frequently used in the set phrase per annum or compounds used in scientific dating.

• (abbreviation) a., ann.

• kiloannum, mega-annum, giga-annum

• nanmu, unman

annum m

1. accusative singular of annus

• gigaannum
• kiloannum
• megaanum
• per annum