1. the reason or reasons one has for acting or behaving in a particular way
2. the general desire or willingness of someone to do something

Examples

• Her motivation for studying medicine was to help people.
• The team’s motivation increased after their coach’s inspiring speech.
• Money was his primary motivation for taking the job.
• She lacked the motivation to exercise regularly.
• Understanding student motivation is key to effective teaching.
• His motivation comes from wanting to make his parents proud.
• The company offers bonuses as motivation for employees.