This is the 122nd most frequent Estonian word.
esimese
"Esimese" means "of the first" in English.
Here, "esimesena" is used to indicate the first person to arrive.
Ta saabus esimesena peole.
He arrived at the party first.
In this case, "esimese" refers to the first task or priority in the context of actions.
Esimese asjana hommikul lähenen projekti planeerimisele.
The first thing in the morning, I approach planning the project.
Here, "esimese" modifies "katse", specifying it as the initial or first attempt.