different between acknowledgement vs commemoration

English

acknowledgement (countable and uncountable, plural acknowledgements)

(most common British spelling, also sometimes used in the US) Alternative spelling of acknowledgment

From commemorate +? -ion, from Old French commemoration (French commémoration), from Latin commemor?ti?nem, verb commemor?re.

commemoration (countable and uncountable, plural commemorations)

The act of commemorating; an observance or celebration to honor the memory of some person or event.
That which serves the purpose of commemorating; a memorial.
(religion) The specification of individual saints in the prayers for the dead.
(Britain) The great festival of the Oxford academic year, usually taking place on the third Wednesday after Trinity Sunday.

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