One belonging to an order in the Roman Catholic Church, next interior to the order of deacons; also, a member of a minor order in the Greek Church.

a person ordained to office in the Church, ranking after the three major orders of bishops, priests and deacons.

a clergyman an order below deacon; one of the Holy Orders in the unreformed western Christian Church and the eastern Catholic Churches but now suppressed in the Roman Catholic Church

The minister who reads the epistle at a solemn celebration of the Holy Communion, whether he is a bishop, priest, deacon, or layman.

A lay person who assists the deacon and celebrant, and normally reads the Epistle at the Eucharist.

Subdeacon is a title used in various branches of Christianity. It is sometimes spelled with a hyphen: sub-deacon.