Definition of per annum in US English:

per annum

adverb

  • For each year (used in financial contexts)

    ‘an average growth rate of around 2 percent per annum’
    annually, once a year, by the year, per annum, every year, each year
    View synonyms

Origin

Early 17th century: Latin.

Pronunciation

per annum

/pər ˈænəm//pər ˈanəm/