This is the 9382nd most frequent Russian word.
терентьева
"Терентьева" is a Russian surname, typically derived from the male name Terentiy.
Here, 'терентьева' functions as a proper noun, a surname of a subject, showing action performed by the person.
Терентьева написала потрясающий рассказ.
Terentyeva wrote an amazing story.
In this instance, 'терентьева' is used to indicate a person, specifically in the instrumental case to show that the meeting happened with her.
Мы встретились с Терентьевой вчера вечером.
We met with Terentyeva yesterday evening.
Here, 'терентьева' is applied in the dative case, indicating possession by the person referenced by the surname.