Acting as an instrument; serving as a means; contributing to promote; conductive; helpful; serviceable; as, he was instrumental in conducting the business.
Pertaining to, made by, or prepared for, an instrument, esp. a musical instrument; as, instrumental music, distinguished from vocal music.
Applied to a case expressing means or agency; as, the instrumental case. This is found in Sanskrit as a separate case, but in Greek it was merged into the dative, and in Latin into the ablative. In Old English it was a separate case, but has disappeared, leaving only a few anomalous forms.
In chess one cannot control everything. Sometimes a game takes an unexpected turn, in which beauty begins to emerge. Both players are always instrumental in this. Vladimir Kramnik
The mind is absolutely instrumental in achieving results, even for athletes. Sports psychology is a very small part, but it's extremely important when you're winning and losing races by hundredths and even thousandths of a second. Michael Johnson
I had my first 'Survivor Series' in 1991 and I was fortunate enough to be an instrumental part of the shows I was on. Ric Flair
I like to think that I've been a good manager. That fact has been very instrumental in making Linux a successful product. Linus Torvalds
I've had a life that has taken many interesting paths. I've learned a lot from mentors who were instrumental in shaping me, and I want to share what I've learned. Herbie Hancock