D defs.my
Entry 2 senses Webster, 1913

Commemoration

/kəm-ĕmˌ-ẽr-āsh'-ən/ · Com·mem·o·ra·tion · IPA /kəˌmɛməˈɹeɪʃən/
01 n. The act of commemorating; an observance or celebration designed to honor the memory of some person or event.
  1. 1.
    The act of commemorating; an observance or celebration designed to honor the memory of some person or event.
    “This sacrament was designed to be a standing commemoration of the death and passion of our Lord.” — Abp. Tillotson.
    “The commonwealth which . . . chooses the most flagrant act of murderous regicide treason for a feast of eternal commemoration.” Burke.
  2. 2.
    Whatever serves the purpose of commemorating; a memorial.
Phrases & compounds
Commemoration day — at the University of Oxford, Eng., an annual observance or ceremony in honor of the benefactors of the University, at which time honorary degrees are conferred.