1625–35; alteration (with -u- of annual) of Medieval Latin superannātus over a year old (said of cattle), equivalent to super ann(um) beyond a year + -ātus -ate1; see -ed2 Unabridged


verb (used with object), superannuated, superannuating.
to allow to retire from service or office on a pension because of age or infirmity.
to set aside as out of date; remove as too old.
verb (used without object), superannuated, superannuating.
to be or become old, out of date, or retired.

1640–50; back formation from superannuated Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
superannuate (ˌsuːpərˈænjʊˌeɪt)
1.  to pension off
2.  to discard as obsolete or old-fashioned

superannuated (ˌsuːpərˈænjʊˌeɪtɪd)
1.  discharged, esp with a pension, owing to age or illness
2.  too old to serve usefully
3.  obsolete
[C17: from Medieval Latin superannātus aged more than one year, from Latin super- + annus a year]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"retired on account of old age," 1633, "obsolete, out of date," from M.L. superannuatus "more than a year old" (of cattle), from L. super "beyond, over" (see super-) + annus "year" (see annual).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Only an occasional banana grove or superannuated rubber plantation offers a spot of variety.
It goes further than that the place is superannuated, and may well have to be
  torn down and replaced.
Take, for instance, the question of retiring a superannuated teacher.
Fabricating missing body parts for two superannuated motor cars.
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