Galatians ga·la·tians UK/ɡəˈleɪʃənz/ uncommon noun 1. a New Testament book containing the epistle from Saint Paul to the Galatians SynonymsEpistle of Paul the Apostle to the GalatiansEpistle to the Galatians Related words Broader terms book Parts New Testament WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved.