Meaning

noun the rational and systematic study of religion and its influences and of the nature of religious truth

noun a particular system or school of religious beliefs and teachings

noun the learned profession acquired by specialized courses in religion (usually taught at a college or seminary)

originFrom Middle English theologie, from Middle French theologie, from Old French theologie, from Latin theologia, from Koine Greek θεολογία (theología), from θεολόγος (theológos, adjective), from θεός (theós) + λόγος (lógos). By surface analysis, theo- + -logy.

Etymology from Wiktionary, CC BY-SA 3.0