Instrumental
Definition 1 of 3
Pro Tip 1/3
Agent of Change
Indicates someone or something is a major factor in causing or driving change. Her research was instrumental in changing the laws.
Pro Tip 2/3
Not the Sole Factor
Usually means there are other contributing factors, although 'instrumental' points out a significant one. His advice was instrumental, but there were other factors in my decision.
Pro Tip 3/3
No Physical Tools
Does not refer to physical tools, but to actions or things abstractly affecting outcomes. Networking was instrumental for her career advancement.