1. the act or state of taking part in something or being connected with something
2. the state of being emotionally or personally connected to someone or something
3. a romantic or intimate relationship with someone

Examples

• Her involvement in the school play helped her gain confidence.
• The company denied any involvement in the scandal.
• Parent involvement is crucial for student success.
• His emotional involvement in the project made it difficult to be objective.
• The police are investigating his involvement in the crime.
• She ended her involvement with the organization last year.
• Their romantic involvement lasted only a few months.