Interrogation :: Interrogation (n.) 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..
Interrogative :: Interrogative (a.) Denoting a question; expressed in the form of a question; as, an interrogative sentence; an interrogative pronoun..
Interrogative :: Interrogative (n.) A word used in asking questions; as, who? which? why?.
Interrogatively :: Interrogatively (adv.) In the form of, or by means of, a question; in an interrogative manner..