Etymology
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superannuate (v.)

1640s, "render obsolete," back-formation from superannuated. Meaning "impair or disqualify by old age" is from 1690s. Related: Superannuating.

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Definitions of superannuate

superannuate (v.)
retire and pension (someone) because of age or physical inability;
superannuate (v.)
declare to be obsolete;
superannuate (v.)
become obsolete;
superannuate (v.)
retire or become ineligible because of old age or infirmity;
From wordnet.princeton.edu