noun

• Something or someone puzzling, mysterious or inexplicable.
• A riddle, or a difficult problem.
• Riddles and puzzles, collectively.
• Mysteriousness; obscurity; lack of clarity.
• A style of literature characterized by obscurity and hints of transcendental meaning.
• A protein with three LIM domains (a conserved cysteine- and histidine-rich structure of two adjacent zinc fingers) at the C terminus that regulates protein phosphorylation.
• The Talaud kingfisher, Todiramphus enigma.
• A species of grasshopper, Oedaleonotus enigma.
• A rare species of moth, Heliothis enigma.
• (historical) A German device used during World War II to encode strategic messages.
• Alternative form of Enigma [(historical) A German device used during World War II to encode strategic messages.]