Entry 2 senses · 2 variants Webster, 1913 Interrogatory /ĭnˌ-tĕr-äg'-ət-ôrˌ-ē/ · In·ter·rog·a·to·ry · IPA /ˌɪntəˈɹɑɡəˌtɔɹi/ n. a. 01 n. A formal question or inquiry; pl. Interrogatories ((#)) 1. A formal question or inquiry;(Law) 02 a. Containing, expressing, or implying a question; as, an interrogatory sentence. 1. Containing, expressing, or implying a question; as, an interrogatory sentence.