Definition of "enigma" []

• One that is puzzling, ambiguous, or inexplicable. (noun)
• A perplexing speech or text; a riddle. (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.

• "Suffice it to say here that this triple enigma is as comforting as wine and open as an English fireside; that this thing that bewilders the intellect utterly quiets the heart: but out of the desert, from the dry places and, the dreadful suns, come the cruel children of the lonely God; the real Unitarians who with scimitar in hand have laid waste the world."
• "Nathan Lee in the Voice: See Los Muertos with virgin eyes; this cool-headed enigma is best approached cold, ignorant of everything but the title."
• "The C-value enigma is real, and there is a lot of research going on right now investigating it."