What does "annually" mean?

Once every year without fail, yearly

What is a synonym for "annually"?

Common synonyms include: every year, per year, yearly, each year, p.a., per annum.

/ˈæn.jʊə.li/ adv

adv ·Rare ·Advanced level

Adverb

1
Once every year without fail, yearly not-comparable
"The Sunshine Festival is held annually, at the end of May."

Adverb

1
without missing a year wordnet
2
by the year; every year (usually with reference to a sum of money paid or received) wordnet

"The conference takes place annually."

From annual + -ly.