This is the 398th most frequent Serbian word.
повремено
"Повремено" means "occasionally" in English.
Here, 'повремено' is used to indicate the frequency with which the action 'идем у позориште' (go to the theater) is performed, meaning it happens from time to time but not regularly.
Повремено идем у позориште.
I occasionally go to the theater.
In this context, 'повремено' describes the irregular frequency of the action 'обнављам своје знање' (refresh my knowledge), emphasizing it happens sporadically.
Читањем повремено обнављам своје знање.
By reading, I occasionally refresh my knowledge.
Here, 'повремено' refers to the sporadic and non-regular interaction with 'старим пријатељима' (old friends).