IPA: /ˌɪntəˈrɒɡətəri/
KK: /ˌɪntəˈrɑːɡətɔːri/
Relating to or characterized by asking questions or seeking information.
The lawyer presented an interrogatory statement to clarify the witness's testimony.
A formal question that is usually written and requires a response, often used in legal contexts.
The lawyer submitted an interrogatory to gather information from the witness.
Interrogatory is formed from "inter-" (meaning between) and "rogare" (meaning to ask). The word describes something that involves asking questions, particularly in a legal context where questions are posed between parties.
Think of asking questions 'between' ('inter-') people, which is what 'interrogatory' means.