This is the 953rd most frequent Serbian word.
истовремено
"Истовремено" means "simultaneously" or "at the same time" in English.
In this sentence, 'истовремено' is used to indicate that two actions are occurring at the same time: reading and listening to music.
Читао је књигу и истовремено слушао музику.
He was reading a book and simultaneously listening to music.
Here, 'истовремено' shows synchronization between the start of the project and assigning tasks.
Истовремено са почетком пројекта, сви чланови тима су добили своје задатке.
Simultaneously with the start of the project, all team members received their assignments.
In this example, 'истовремено' describes an action (showing charts) occurring at the same moment as another action (speaking convincingly).