This is the 250th most frequent Serbian word.
увече
In the evening.
Here, 'увече' describes the time of day (evening) when the action (reading) occurs.
Увече волим да читам књигу пред спавање.
In the evening, I enjoy reading a book before sleeping.
Here, 'увече' is used to clarify when the visit is expected to happen, presenting a time comparison between evening and the next day.
Да ли долазиш код мене увече или сутра?
Are you coming to my place in the evening or tomorrow?
In this sentence, 'увече' again specifies the part of the day (evening) associated with the action of going out.