| 1. | Also called interrogation point, interrogation mark. a mark indicating a question: usually, as in English, the mark (?) placed after a question. |
| 2. | something unanswered or unknown: His identity is still a question mark to most of us. |
| 3. | an anglewing butterfly, Polygonia interrogationis, having silver spots shaped like a question mark on the underside of each hind wing. |
| interrogation point n. See question mark. |
| question mark n. A punctuation symbol (?) written at the end of a sentence or phrase to indicate a direct question. Also called interrogation point. |
A punctuation mark (?) that follows a direct question: “Is Ralph really seven feet tall?”