Of, relating to, or being any of various Christian religious congregations whose members seek to be filled with the Holy Spirit, in emulation of the Apostles at Pentecost.
n. A member of a Pentecostal congregation: "Pentecostals rejected the belief of many fundamentalists that . . . God had ceased to reveal himself to man"(John B. Judis). Pen'te·cos'tal·ism n., Pen'te·cos'tal·ist adj. & n.