In·ter·ro·ga·tion n.
 1. The act or process of interrogating or questioning; examination by questions; an instance of interrogating; inquiry.
 2. A question put; an inquiry.
 3. A point, mark, or sign, thus [?], indicating that the sentence with which it is connected is a question. It is used to express doubt, or to mark a query.  Usually called a question mark; called also interrogation point.
 Note: ☞ In works printed in the Spanish language this mark is not only placed at the end of an interrogative sentence, but is also placed, inverted [as thus (¿)], at the beginning.

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 interrogation point
      n : a punctuation mark (?) placed at the end of a sentence to
          indicate a question [syn: question mark]