keyfactor
nounUK /ˈkiːˌfæktə/
US /ˈkiˌfæktər/
A key factor is a very important thing that helps make something happen.
Hard work was the key factor in her winning the race.
OTHER MEANINGS
2. The most important element in a decision or result.
Cost was the key factor when they chose the cheaper car.
3. A critical piece that determines success or failure.
Teamwork is the key factor for any good project.
4. A main reason behind a change or outcome.
Weather was a key factor in the game being canceled.