1. a person who encourages or inspires others to take action or work harder
2. something that provides a reason or incentive for action

Examples

• The coach was an excellent motivator who inspired the team to victory.
• She hired a personal motivator to help her achieve her fitness goals.
• Money is often a strong motivator for hard work.
• Fear of failure can be a powerful motivator for some students.
• The motivational speaker was known as an effective motivator.
• Recognition from peers serves as a key motivator in the workplace.
• The promise of a promotion was the main motivator behind his extra effort.