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per annum

[per an-uh m]
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adverb
  1. by the year; yearly.
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Origin of per annum

Borrowed into English from Latin around 1595–1605
Can be confusedper annum per capita per diem
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for per annum

per annum

adverb
  1. every year or by the year
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for per annum

Latin, literally "by the year," from per (see per) + annum, accusative singular of annus "year" (see annual).

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Online Etymology Dictionary, © 2010 Douglas Harper