Source : Webster's Revised Unabridged Dictionary (1913)

Annually \An"nu*al*ly\, adv.
   Yearly; year by year.

Source : WordNet®

annually
     adv 1: without missing a year; "they travel to China annually"
            [syn: {yearly}, {every year}, {each year}]
     2: by the year; every year (usually with reference to a sum of
        money paid or received); "he earned $100,000 per annum";
        "we issue six volumes per annum" [syn: {per annum}, {p.a.},
         {per year}, {each year}]