If your work performance is reviewed annually, your boss might consider giving you a raise each year. The adverb annually comes from the adjective annual, which is rooted in the Late Latin annualis, based on annus, or "year."

Is annually an adverb?

ANNUALLY (adverb) definition and synonyms | Macmillan Dictionary.

Which kind of adverb is annually?

Adverbs of frequency always describe how often something occurs, either in definite or indefinite terms. An adverb that describes definite frequency is one such as weekly, daily, or yearly.