This is the 1762nd most frequent Russian word.
журналиста
"Journalist."
Here, 'журналиста' is the accusative singular form of 'журналист', showing it is the object of the verb 'встретил'.
Я встретил журналиста на конференции.
I met a journalist at the conference.
In this sentence, 'журналиста' is in the genitive singular form of 'журналист', denoting possession or association.
У журналиста интересная статья в газете.
The journalist has an interesting article in the newspaper.
Here, 'журналиста' is in the instrumental singular form of 'журналист', indicating the individual being accompanied or associated in this context.