This is the 3787th most frequent Russian word.
электронное
Electronic.
The word 'электронное' is used to describe 'письмо' (letter), indicating that it is electronic or digital rather than physical.
Электронное письмо пришло на мой адрес.
An email came to my address.
Here, 'электронное' modifies 'оборудование' (equipment), denoting that the equipment operates using electronics.
Магазин предложил скидку на электронное оборудование.
The store offered a discount on electronic equipment.
In this sentence, 'электронное' refers to 'управление процессами' (process control), suggesting that the control is facilitated through electronic means.