interrogative

(noun) a sentence of inquiry that asks for a reply. Synonyms: question, interrogation, interrogative sentence. Examples: "He asked a direct question." "He had trouble phrasing his interrogations."

(noun) some linguists consider interrogative sentences to constitute a mood. Synonyms: interrogative mood.

(adj) relating to verbs in the so-called interrogative mood. Example: "Not all questions have an interrogative construction."

(adj) relating to the use of or having the nature of an interrogation. Synonyms: interrogative (vs. declarative), interrogatory (vs. declaratory).