• (a.) Containing, expressing, or implying a question; as, an interrogatory sentence. • (n.) A formal question or inquiry; esp. (Law), a question asked in writing. Found on http://thinkexist.com/dictionary/meaning/interrogatory/
The formal and written question to the witness or the party of the lawsuit, from whom the answer is required in a specified time in writing and under the oath. Found on http://www.encyclo.co.uk/local/21213
In`ter·rog'a·to·ry noun ; plural Interrogatories . [ Confer French interrogatoire .] A formal question or inquiry; esp. (Law) , a question asked in writing. Macaulay. Found on http://www.encyclo.co.uk/webster/I/84