Commemoration

[kuh-mem-uh-rey-shuh n] /kəˌmɛm əˈreɪ ʃən/

noun
1.
the act of .
2.
a service, celebration, etc., in memory of some person or event.
3.
a memorial.
4.
(in many Christian churches) a special service or prayer for the lesser feast on days on which two feasts of unequal rank are celebrated.
/kəˌmɛməˈreɪʃən/
noun
1.
the act or an instance of commemorating
2.
a ceremony or service in memory of a person or event
n.

late 14c., “a calling to mind,” also “service or church festival commemorating something,” from Old French comemoration, from Latin commemorationem (nominative commemoratio) “reminding, mention,” noun of action from past participle stem of commemorare “to call to mind,” from com-, intensive prefix (see com-), + memorare “to remind,” from memor “mindful of” (see memory).

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Commemorative
[kuh-mem-uh-rey-tiv, -er-uh-tiv] /kəˈmɛm əˌreɪ tɪv, -ər ə tɪv/ adjective 1. serving to : a commemorative monument; a commemorative dinner. 2. (of a coin, medal, or postage stamp) issued to a historical event, to honor the memory of a personage, etc. noun 3. anything that . adj. 1610s, from commemorate + -ive. As a noun meaning […]
Commemoratory
[kuh-mem-er-uh-tawr-ee, -tohr-ee] /kəˈmɛm ər əˌtɔr i, -ˌtoʊr i/ adjective 1. (def 1).
Commen
obsolete spelling of common. [L.J. Cohen. Proc SJCC 30:671-676, AFIPS (Spring 1967)]. (1994-11-30)

Commence
[kuh-mens] /kəˈmɛns/ verb (used with or without object), commenced, commencing. 1. to begin; start. /kəˈmɛns/ verb 1. to start or begin; come or cause to come into being, operation, etc v. c.1300, from Old French comencier “to begin, start” (10c., Modern French commencer), from Vulgar Latin *cominitiare, originally “to initiate as priest, consecrate,” from Latin […]
Commenced
[kuh-mens] /kəˈmɛns/ verb (used with or without object), commenced, commencing. 1. to begin; start. /kəˈmɛns/ verb 1. to start or begin; come or cause to come into being, operation, etc v. c.1300, from Old French comencier “to begin, start” (10c., Modern French commencer), from Vulgar Latin *cominitiare, originally “to initiate as priest, consecrate,” from Latin […]