This is the 308th most frequent Greek word.
στον
"Στον" means "to the" or "in the" (masculine singular).
In this sentence, 'στον' is a preposition combined with the definite article 'τον', functioning to indicate motion towards a male direct object.
Πηγαίνω στον γιατρό.
I am going to the doctor.
Here, 'στον' is used to denote location on a masculine noun, meaning 'on the'.
Μένω στον δεύτερο όροφο.
I live on the second floor.
In this example, 'στον' introduces directionality towards the male recipient of an action.