Baptist

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A member of an evangelical Protestant church of congregational polity, following the Reformed tradition in worship and believing in freedom of conscience, separation of church and state, and baptism only of voluntary, conscious believers.
• noun One that baptizes.

from The Century Dictionary.

• noun One who administers baptism: the title (with a capital letter) of John, the forerunner of Christ.
• noun [capitalized] A member or an adherent of one of those Christian denominations which maintain that baptism can be administered only upon a personal profession of Christian faith.

from the GNU version of the Collaborative International Dictionary of English.

• noun One who administers baptism; -- specifically applied to John, the forerunner of Christ.
• noun One of a denomination of Christians who deny the validity of infant baptism and of sprinkling, and maintain that baptism should be administered to believers alone, and should be by immersion. See Anabaptist.
• noun a sect of Baptists who are Arminian in doctrine, and practice open communion.
• noun a sect of Baptists who keep the seventh day of the week, or Saturday, as the Sabbath. See Sabbatarian. The Dunkers and Campbellites are also Baptists.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A Protestant denomination of Christianity, which believes in the baptism of believers, as opposed to the baptism of infants.
• noun An adherent of this denomination.
• adjective Of, relating to, or adhering to the Baptist religious denomination.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun follower of Baptistic doctrines