Etymology
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superannuated (adj.)

1630s, "obsolete, out of date;" 1740, "retired on account of old age," from Modern Latin superannuatus, alteration (perhaps by influence of annual) of Medieval Latin superannatus (which meant "more than a year old" and was used of cattle), from Latin super "beyond, over" (see super-) + annus "year" (see annual (adj.)). Earlier in same sense was superannate (c. 1600), from Medieval Latin superannatus. Compare French suranner.

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Definitions of superannuated

superannuated (adj.)
too old to be useful; "He left the house...for the support of twelve superannuated wool carders"- Anthony Trollope;
Synonyms: overage / overaged / over-the-hill
superannuated (adj.)
old; no longer valid or fashionable;
superannuated laws
Synonyms: outdated / out-of-date
From wordnet.princeton.edu