This is the 271st most frequent Turkish word.
eşi
"Spouse" or "partner."
Here, 'eşi' is used to mean 'spouse' referring to Ali's married partner.
Ali'nin eşi çok nazik bir insandır.
Ali's spouse is a very kind person.
In this sentence, 'eşi' is used to denote 'the matching or paired item' for something.
Bu elbisenin eşi başka bir mağazada bulunmaktadır.
The match for this dress is found in another store.
Here, 'eşi' conveys 'peer' or 'equal' in the context that there was no one comparable to this person in history.