This is the 11373rd most frequent Turkish word.
elçinin
"Elçinin" means "of the messenger" or "of the ambassador" in English.
In this sentence, 'elçinin' refers to an ambassador in a possessive form, indicating the item belongs to the ambassador.
Elçinin mektubu gecikmiş.
The ambassador's letter is delayed.
Here, 'elçinin' is used to express that the envoy is the one who cares about the subject mentioned.
Elçinin önemsediği konu barıştı.
The matter the envoy cared about was peace.
In this instance, 'elçinin' denotes the messenger's family in the genitive case.