This is the 304th most frequent Estonian word.
mina
"I" (first-person singular pronoun).
Here, 'mina' is the subject pronoun 'I', indicating the performer of the action.
Mina lähen täna kooli.
I am going to school today.
Although not directly 'mina', the possessive form 'minu' is derived from 'mina', showing possession.
See on minu raamat, mitte sinu.
This is my book, not yours.
In this sentence, 'mina' is the second subject in a comparison, emphasizing the subject.