of·fer·to·ry 
(ô
f
ər-tôr
′ē,
ŏf
ər-)
n. pl. of·fer·to·ries 1. often
Offertorya. One of the principal parts of the Eucharistic liturgy at which bread and wine are offered to God by the celebrant.
b. A musical setting for this part of the liturgy.
2. A collection of offerings at a religious service.
[Middle English offertori, from Late Latin offertōrium, from Latin offerre, to offer; see OFFER.]