/ ˌɪntəˈlɒkjətə(r); NAmE ˌɪntərˈlɑːk-/ noun ( formal )
1.
a person taking part in a conversation with you
2.
a person or an organization that talks to another person or organization on behalf of sb else
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WORD ORIGIN
early 16th cent.: modern Latin , from Latin interlocut- interrupted (by speech), from the verb interloqui , from inter- between + loqui speak.