driving factor
nounUK /ˈdraɪ.vɪŋ ˈfæk.tər/
US /ˈdraɪ.vɪŋ ˈfæk.tɚ/
The main thing that makes something happen.
Curiosity was the driving factor behind her science project.
OTHER MEANINGS
2. The most important element that pushes a process or change forward.
Cost was the driving factor in their decision to move.
3. A person or thing that strongly encourages a particular outcome.
The coach's encouragement was a driving factor in the team's success.
4. The central reason behind a trend or pattern.
Technology is a driving factor in how quickly news spreads today.