Definition of "paradox" []

• A seemingly contradictory statement that may nonetheless be true: the paradox that standing is more tiring than walking. (noun)
• One exhibiting inexplicable or contradictory aspects: "The silence of midnight, to speak truly, though apparently a paradox, rung in my ears” ( Mary Shelley). (noun)
• An assertion that is essentially self-contradictory, though based on a valid deduction from acceptable premises. (noun)
• A statement contrary to received opinion. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The twin paradox is resolved when one observes that one of the twins accelerated during the turnaround, which means that his reference frame was not inertial and thus could not be used in the framework of special relativity."
• ""Quite naturally, in the literature they don't use the term paradox, of course.""
• ""To give you some background, the word paradox is Latin for 'beyond opinion.'"