keyoperation
nounUK /ˈkiː ɒpəˈreɪʃən/
US /ˈkiː ɑːpəˈreɪʃən/
A key operation is an important job that must be done.
Checking the tickets is a key operation at the train station.
OTHER MEANINGS
2. A button press on a machine or device.
Each key operation on the cash register prints a receipt.
3. A basic action in math, like adding or multiplying.
Subtraction is a key operation you learn in first grade.
4. A main step in a plan or process.
Mixing the ingredients is a key operation in baking a cake.