[1] : The Collaborative International Dictionary of English v.0.48

interrogation \inter`roga"tion\, n. l. interrogatio: cf. f.
   interrogation.
   1913 webster
   1. the act or process of interrogating or questioning;
      examination by questions; an instance of interrogating;
      inquiry.
      1913 webster

   2. a question put; an inquiry.
      1913 webster

   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.
      1913 webster +pjc

   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
         iques, at the beginning.
         1913 webster
see also:
question mark interrogation point 

[2] : WordNet (r) 2.0

interrogation point
     n : a punctuation mark ? placed at the end of a sentence to
         indicate a question syn: question mark
see also:
question mark 

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