The noun is derived from Middle English patent, which is either:
a , lettres patente, lettres patentes; or
directly from Anglo-Norman and Middle French patente (modern French patent), a clipping of Anglo-Norman lettres patentes, Middle French lettres patentes, lettre patente, and Old French patentes lettres (compare Late Latin patens, littera patens, litterae patentes).
For the derivation of Anglo-Norman and Middle French patente in lettre patente, see etymology 2 below.
The verb is derived from the noun.
From Middle English patent, patente, from Anglo-Norman and Middle French patent (modern French patent), and directly from their etymon Latin patēns, the present active participle of pateō, from Proto-Indo-European *peth₂-.
Modern English dictionary
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