IPA: /ˈɛmɪsəri/
KK: /ˈɛmɪˌsɛri/
A person who is sent to represent someone else, often on a special mission or task.
The king sent an emissary to negotiate peace with the rival kingdom.
Emissary → It is formed from "emittere" (meaning to send out) and the suffix "-ary" (meaning relating to or connected with). An emissary is someone who is sent out on a mission or as a representative.
Think of someone who is 'sent out' ('emittere') on a mission — that's what an emissary does.