offertory (n.)

mid-14c., offertorie, "antiphon said or sung after the Credo during the part of a Mass at which offerings are made," from Medieval Latin offertorium "place where offerings are brought," from Vulgar Latin offertus, corresponding to Latin oblatus, past participle of offerre (see offer (v.)). Meaning "part of a religious service beginning with an offering" is first recorded 1530s; sense of "the collection of money received as offerings" is from 1862. Related: Offertorial.