/ ˌɪntəˈrɒgətɪv; NAmE -ˈrɑːg-/ adjective , noun
■ adjective
1.
( formal ) asking a question; in the form of a question :
an interrogative gesture / remark / sentence
2.
( grammar ) used in questions :
interrogative pronouns / determiners / adverbs (= for example, who, which and why )
► inter·roga·tive·ly adverb
■ noun
( grammar ) a question word, especially a pronoun or a determiner such as who or which
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WORD ORIGIN
early 16th cent.: from late Latin interrogativus , from Latin interrogare , from inter- between + rogare ask.