WordWeb Online

1. The act of sharing in the activities of a group
   "the teacher tried to increase his students' involvement in class activities";
   - engagement, participation, involution
    
2. A connection of inclusion or containment
   "he escaped involvement in the accident"; "there was additional involvement of the liver and spleen"
    
3. A sense of concern with and curiosity about someone or something
   "an involvement in music";
   - interest
    
4. A usually secretive or illicit sexual relationship
   - affair, affaire, intimacy, liaison, amour
    
5. The condition of sharing in common with others (as fellows or partners etc.)
   - participation

Derived forms: involvements

Type of: condition, connectedness, connection, connexion [Brit], curiosity, group action, sexual relationship, status, wonder

Antonym: nonparticipation

Encyclopedia: Involvement