Webster's English Dictionary

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interrogative

1. in.ter.rog.a.tive \.int-*-'ra:g-*t-iv\ aj 1a: having the form or force 
   of a question  1b: used in a question  2: QUESTIONING, INQUISITIVE  - 
   in.ter.rog.a.tive.ly av
2. interrogative n 1: an interrogative utterance  2: a word (as who, what, 
   which) or a particle (as Latin (X-ne) used in asking questions