"interrogative" in the noun sense
1. question, interrogation, interrogative, interrogative sentence
a sentence of inquiry that asks for a reply
"he asked a direct question"
"he had trouble phrasing his interrogations"
2. interrogative mood, interrogative
some linguists consider interrogative sentences to constitute a mood
"interrogative" in the adjective sense
1. interrogative
relating to verbs in the so-called interrogative mood
"not all questions have an interrogative construction"
2. interrogative, interrogatory
relating to the use of or having the nature of an interrogation
Source: WordNet® (An amazing lexical database of English)
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