A·qui·nas (ə-kwīʹnəs), Saint Thomas. 1225-1274.
Italian Dominican friar, theologian, and philosopher. The most influential thinker of the medieval period, his philosophy combined Aristotelianism and elements of Neo-Platonism within a context of Christian thought. His works include the Summa contra gentiles (1259-1264) and the Summa theologiae or theologica (1266-1273).
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