The Roman Calendar and the Mayan Calendar

The roman word came from a separate indo european word, which was at. Atnus in an early form of latin evolved into the word anus in classical latin. And that's the word which the romans used for year. Of course, we get that word in english as annual, an anniversary, meaning once a year,. and annuity, which originally meant a sum that was paid yearly. In finance, we sometimes calculate interest per annum, which, again, means per year.