Interrogation
Pronunciation : In*ter`ro*ga"tion
Part of Speech : n.
Etymology : [L. interrogatio: cf. F. interrogation.]
Definition : 1. The act of interrogating or questioning; examination by questions; 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. 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.
Source : Webster's Unabridged Dictionary, 1913