a seemingly absurd or contradictory statement or proposition which when investigated may prove to be well founded or true:the uncertainty principle leads to all sorts of paradoxes, like the particles being in two places at once
a statement or proposition which, despite sound (or apparently sound) reasoning from acceptable premises, leads to a conclusion that seems logically unacceptable or self-contradictory:the liar paradox [mass noun]:Parmenides was the original advocate of the philosophical power of paradox
a person or thing that combines contradictory features or qualities:cathedrals face the paradox of having enormous wealth in treasures but huge annual expenses