This is the 4195th most frequent Russian word.
таджикистане
"Tаджикистане" is the prepositional case form of "Таджикистан," meaning "in Tajikistan."
The word 'таджикистане' is used here in its locative form to indicate the place where the event occurred.
Я родился в Таджикистане.
I was born in Tajikistan.
In this sentence, 'таджикистане' is again in the locative case, referring to the location of the planned activity.
Мы планируем отдых в Таджикистане.
We are planning a vacation in Tajikistan.
Here, 'таджикистане' denotes the location of the ongoing action, in the prepositional case.