| Definition -
The grammatical voice where the sentence's subject is the verb's object.
1. As opposed to the active voice where the sentence's subject is the verbal agent.
Rome was built in a day.
(The subject Rome is the object of the verb built.)
Oxford English Dictionary - The term's first citation is from 1388:
"A participle of a present tens, either preterit, of actif vois, eithir passif, mai be resoluid into a verbe of the same tens, and a coniunccioun copulatif."
(Wyclif Prol. 57)