from
The Collaborative International Dictionary of English v.0.48
Interrogation \In*ter`ro*ga"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]