Meaning of “undated” in the English Dictionary

"undated" in British English

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undatedadjective

uk /ʌnˈdeɪ.tɪd/ us /ʌnˈdeɪ.t̬ɪd/

An undated document has no date on it:

The cheque/letter was undated.

(Definition of “undated” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"undated" in American English

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undatedadjective [ not gradable ]

us /ʌnˈdeɪ·t̬ɪd/

(of something written) without the day, month, and year on it:

an undated letter

(Definition of “undated” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"undated" in Business English

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undatedadjective

uk /ˌʌnˈdeɪtɪd/ us

not having a known or written date:

The memo is undated but may have been written as early as May.
undated photo/photograph/letter I received an undated letter saying that there would be a delay in opening the account.
The Pettigrew St. business district is shown in this undated photo.

FINANCE (of a bond or other investment) not having a date at which it can be redeemed (= exchanged for cash):

The cash flow from an undated bond can be viewed as a continuous annuity.

(Definition of “undated” from the Cambridge Business English Dictionary © Cambridge University Press)