date stamp - definition and synonyms

noun [countable] 

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singulardate stamp
pluraldate stamps

derived word

date-stamp

verb [transitive]
present tense
I/you/we/theydate-stamp
he/she/itdate-stamps
present participledate-stamping
past tensedate-stamped
past participledate-stamped

Each letter is date-stamped so we know when it came in.