Webster's Revised Unabridged Dictionary · 1913

Anniversary

Anniversary ({not transcribed}) , adjective

[Latin anniversarius; annus year + vertere, versum, to turn: compare French anniversaire.]

Returning with the year, at a stated time; annual; yearly; as, an anniversary feast.
Collocations (2)
Anniversary day (Roman Catholic Church) , See Anniversary, n., 2.
Anniversary week , that week in the year in which the annual meetings of religious and benevolent societies are held in Boston and New York. [Eastern United States]

Anniversary ({not transcribed}) , noun

[Compare French anniversaire.]

1.
The annual return of the day on which any notable event took place, or is wont to be celebrated; as, the anniversary of the Declaration of Independence.
2.
(Roman Catholic Church) The day on which Mass is said yearly for the soul of a deceased person; the commemoration of some sacred event, as the dedication of a church or the consecration of a pope.
3.
The celebration which takes place on an anniversary day. — Dryden