dogma (n.)

"a settled opinion, a principle held as being firmly established," c. 1600 (in plural dogmata), from Latin dogma "philosophical tenet," from Greek dogma (genitive dogmatos) "opinion, tenet," literally "that which one thinks is true," from dokein "to seem good, think" (from PIE root *dek- "to take, accept"). Regarded in 17c.-18c. as a Greek word in English but subsequently nativized.