Origin: Latin suffix -ive
Interrogative has 6 different meanings across 2 categories:
a sentence of inquiry that asks for a reply
"he asked a direct question"
"he had trouble phrasing his interrogations"
some linguists consider interrogative sentences to constitute a mood
A word (pronoun, pronominal adjective, or adverb) implying interrogation, or used for asking a question: why, who, when, etc.
relating to verbs in the so-called interrogative mood
"not all questions have an interrogative construction"
relating to the use of or having the nature of an interrogation
Asking or denoting a question: as, an interrogative phrase, pronoun, or point.