Definition from Wiktionary, the free dictionary
deacon (plural deacons)
- (Church history) A designated minister of charity in the early Church (see Acts 6:1-6).
- (Roman Catholicism) A clergyman ranked directly below a priest, with duties of helping the priests and carrying out parish work.
- (Protestantism) Free Churches: A lay leader of a congregation who assists the pastor.
- (Protestantism) Anglicanism: An ordained clergyman usually serving a year prior to being ordained presbyter, though in some cases they remain a permanent deacon.
- (Protestantism) Methodism: A separate office from that of minister, neither leading to the other; instead there is a permanent deaconate.
- (freemasonry) A junior Lodge officer.
- (Mormonism) The lowest office in the Aaronic priesthood, generally held by 12 or 13 year old boys or recent converts.
- (US, animal husbandry) A male calf of a dairy breed, so called because they are usually deaconed (see below).
- (Scotland) The chairman of an incorporated company.
Derived terms 
A designated minister of charity in the early Church
A clergyman ranked directly below a priest
lay leader of a Protestant congregation
A junior Lodge officer
See also 
- (Christianity, music) For a choir leader to lead a hymn by speaking one or two lines at a time, which are then sung by the choir.
- (US, animal husbandry) To kill a calf shortly after birth.
- (US) To place fresh fruit at the top of a barrel or other container, with spoiled or imperfect fruit hidden beneath.