Index of English words, starting with "in"

(1) - 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.
(2) - Interrogation (n.) A question put; an inquiry.
(3) - Interrogation (n.) The act of interrogating or questioning; examination by questions; inquiry.

(1) - Interrogative (n.) A word used in asking questions; as, who? which? why?
(2) - Interrogative (a.) Denoting a question; expressed in the form of a question; as, an interrogative sentence; an interrogative pronoun.

(1) - Interrogatively (adv.) In the form of, or by means of, a question; in an interrogative manner.

(1) - Interrogatory (a.) Containing, expressing, or implying a question; as, an interrogatory sentence.
(2) - Interrogatory (n.) A formal question or inquiry; esp. (Law), a question asked in writing.