This is the 217th most frequent Russian word.
операции
"Operations" or "procedures."
Here, 'операции' refers to financial transactions.
Сегодня я участвовал в банковской операции.
Today I participated in a banking operation.
In this sentence, 'операцию' denotes a medical surgery.
Хирург провёл сложную операцию.
The surgeon performed a complex operation.
Here, 'операции' is used in the context of military action.