Etymology
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dating (n.)

"act or practice of having (romantic) dates," by 1939, verbal noun from date (v.2).

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datable (adj.)

"capable of having a date affixed," 1837, from date (n.1) + -able.

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misdate (v.)

"give a false or wrong date to, date erroneously," 1580s, from mis- (1) "badly, wrongly" + date (v.1). Related: Misdated; misdating. As a noun by 1832.

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update (v.)
1944, in reference to information, 1952 in reference to persons, from up (adv.) + date (v.1). Related: Updated; updating. The noun is attested from 1967.
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outdated (adj.)

also out-dated, "grown obsolete," 1590s, from out- + past participle of date (v.1). Out-of-date is attested from 1610s. The verb, out-date "make obsolete" is by 1640s, perhaps 1590s.

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undated (adj.)
"left without indication of date," 1560s, from un- (1) "not" + past participle of date (v.1) "assign a date to." Compare similarly formed German undatirt, Dutch ongedateerd, Swedish odaterad.
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postdate (v.)

also post-date, "to affix a later date to than the real one," 1620s, from post- + date (v.1) "to assign a date to, to mark a date on." Related: Postdated; postdating. Intransitive meaning "be of a later date than" is by 1909.

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backdate (v.)
also back-date, "assign a date to earlier than the actual one," by 1881 (implied in back-dated), from back (adv.) + date (v.1). Compare antedate. Related: Backdated; backdating.
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up-to-date (adv.)
1840, "right to the present time," from phrase up to date, probably originally from bookkeeping. As an adjective from 1865. Meaning "having the latest facts" is recorded from 1889; that of "having current styles and tastes" is from 1891.
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antedate (v.)
1580s, "to date before the true time," earlier as noun meaning "a backdating, false early date attached to a document or event" (1570s); from Latin ante "before" (from PIE root *ant- "front, forehead," with derivatives meaning "in front of, before") + date (v.1). Meaning "be of older date than" is from 1660s. Related: Antedated; antedating.
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