Etymology
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outdated (adj.)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 Out-of-date is attested from 1610s.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.

updated on December 12, 2020

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Definitions of outdated from WordNet

outdated (adj.)
old; no longer valid or fashionable;
outdated equipment
Synonyms: out-of-date / superannuated
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.