This is the 555th most frequent Estonian word.
eestit
The word "eestit" is the partitive case form of "Eesti," meaning "Estonia" in English.
Here, 'Eestit' is in the partitive case, signifying the direct object of the sentence.
Nad külastasid möödunud suvel Eestit.
They visited Estonia last summer.
In this sentence, 'Eestit' is in the partitive case, which is used here as the object of the verb referring to the idea of regarding Estonia.
Eestit peetakse kauni loodusega riigiks.
Estonia is regarded as a country with beautiful nature.
In this case, 'Eestit' is in the partitive case, used after the preposition 'pärast' indicating the time relation to Estonia.