The definition of pivotal is something which is central, vital or very important.
An example of something that would be described as a pivotal decision in your life is the decision to marry your spouse.
- of or acting as a pivot
- on which something turns or depends; central, crucial, critical, etc.
- Of, relating to, or serving as a pivot.
- Being of vital or central importance; crucial: a decision that was pivotal to our success.