Definition of: superannuate

(s′pər·an′y·āt) v.t. ·at·ed, ·at·ing
1. To retire or retire and pension on account of age: chiefly in past participle.
2. To set aside or discard as obsolete or too old. [<Med. L superannuatus more than a year old (said of cattle) <L super annum <super beyond + annus a year]
—su′per·an′nu·at′ed adjective
—su′per·an′nu·a′tion noun