Greek and Latin Roots of English: Anniversary.

According to the Merriam-Webster Dictionary anniversary is "the date on which an event, such as a wedding, occurred in some previous year", for example, 25th anniversary (like Mario Bros in this pic).

Anniversary derives from Latin anniversarius, meaning "returning annually", from annus "year" + versus "to turn".

With the root annus we have words such as annual biannual, semiannual or biennium.

With the root versus, inversion, universe or versatile.

Greek and Latin Roots of English: Anniversary.