Etymology
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pentecostal (adj.)

1660s, "pertaining to the Pentecost," from Latin pentecostalis (Tertullian), from pentecoste (see Pentecost). With a capital P- and meaning "Pentecostalist," in reference to Christian sects emphasizing gifts of the Holy Spirit (Acts ii), it is attested from 1904 (noun and adjective). Related: Pentecostalism (1932); Pentecostalist.

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Definitions of pentecostal
1
pentecostal (adj.)
of or relating to or characteristic of any of various Pentecostal religious bodies or their members;
pentecostal (adj.)
of or relating to or occurring at Pentecost;
2
Pentecostal (n.)
any member of a Pentecostal religious body;
Synonyms: Pentecostalist
From wordnet.princeton.edu