This is the 712th most frequent Greek word.
εκείνος
"Εκείνος" means "that one" or "he" (demonstrative pronoun).
'Εκείνος' is used here as a demonstrative pronoun to emphasize a specific person.
Εκείνος είναι ο καλύτερος φίλος μου.
He is my best friend.
In this sentence, 'εκείνος' refers to the subject implied in the context.
Μου αρέσουν τα βιβλία εκείνος που έγραψε.
I like the books he wrote.
'Εκείνος' functions as an attributive pronoun modifying the noun 'ήλιος.'