• per ann.

Borrowed fromLate Latinper annum, English from the 16th century.

perannum

1. In ayear.
2. For ayear.
   • 1918,International Review of Agricultural Economics, volume 9, page917:

     Areas of no more than ten acres of crown land may be granted asbee-arms on annual licenses, the rent being one shilling an acreper annum.

• peryear,yearly,annually

In post-classical Latin (4th or 5th century) in reference to a sum of money due each year.Already in the 3rd century in the sense of "through the year". From the prepositionper(“through; during”) +annum, the accusative singular ofannus(“year”).

• (Classical Latin)IPA^(key):/ˈper ˈan.num/,[ˈpɛr ˈänːʊ̃ˑ]
• (modern Italianate Ecclesiastical)IPA^(key):/ˈper ˈan.num/,[ˈpɛr ˈänːum]

perannum (notcomparable)

1. Used other than figuratively or idiomatically:seeper,‎annum;throughout theyear
   • 1st century BC or AD, Ovid,Fasti, I, 1f. and III, 111f.; ed. and transl.:Ovid's Fasti with an English translation by Sir James George Frazer, 1959, p. 2f. and p. 128f.:

     Tempera cum causis Latium digestaper annum
     lapsaque sub terras ortaque signa canam.

     The order of the calendarthroughout the Latinyear, its causes, and the starry signs that set beneath the earth and rise again, of these I'll sing.

     libera currebant et inobservataper annum
     sidera ; constabat sed tamen esse deos.

     The stars ran their courses free and unmarkedthroughout the year ; yet everybody agreed that they were gods.

2. (proscribed)per annum; peryear

• annales
• prō annō