Oxymoron? "I'm certain that nothing is certain in this world" Not said by me. Doesn't make sense to me because it's contradictory. Is this considered an oxymoron? According to The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2000 by Houghton Mifflin Company: n. pl. ox·y·mo·ra (-môr, -mr) or ox·y·mo·rons A rhetorical figure in which incongruous or contradictory terms are combined, as in a deafening silence and a mournful optimist. In this case, it's not two terms. It's a complete sentence, albeit a simple one. What do you call it then?