This is the 3007th most frequent Russian word.
единовременно
Simultaneously; at the same time.
The word "единовременно" here means "at one time," referring to the limitation of performing tasks only simultaneously in one instance.
Единовременно я могу выполнить только одну задачу.
At one time, I can perform only one task.
"Единовременно" in this sentence signifies "in one go," emphasizing the continuous effort without stopping.
Этот проект был выполнен единовременно, без перерывов.
This project was completed in one go, without breaks.
Here, "единовременно" is used to convey "all at once," highlighting actions happening simultaneously which might lead to confusion or difficulty understanding.