Pentecostal /ˌpen.tɪˈkɒs.təl/adjective 2noun 2forms 1 adjective2 •Of, or relating to Pentecost. •Of, or relating to a Christian religious movement that emphasizes the Holy Spirit. noun2 •A member of a Pentecostal church.The Pentecostals had drowned them with their discotheque music, frenzied dancing and ecstatic prayer. — 2014 •(no longer used) An offering formerly made to the parish priest, or to the mother church, at Pentecost. formsPentecostals