A·qui·nas 
(ə-kwīnəs), Saint Thomas 1225-1274.
(ə-kwīnəs), 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 Neoplatonism 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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