This is the 14048th most frequent Russian word.
одновременное
Simultaneous.
The word 'одновременное' is used as an adjective modifying the noun 'начало', meaning 'simultaneous' or occurring at the same time in this context.
Мы организовали одновременное начало двух мероприятий.
We organized the simultaneous start of two events.
Here, 'одновременное' describes the noun 'выполнение', emphasizing that the activities occur at the same time.
Одновременное выполнение нескольких задач требует концентрации.
Simultaneous execution of multiple tasks requires concentration.
In this sentence, 'одновременное' modifies 'развитие', underlining the synchronized growth of abilities and understanding.