A connection of inclusion or containment

• Inclusion; entanglement
• Sharing the activities of a group
• A usually secretive or illicit sexual relationship

Wiktionary Word definitions in Wiktionary
n. The act of involving, or the state of being involved.

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun COLLOCATIONS FROM OTHER ENTRIES active participation/involvement (= in an activity or event ) ▪ Active participation in community life is important in small towns and villages. ▪ The school encourages the active involvement of parents. deny any involvement ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1706, from involve + -ment .

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Involvement \In*volve"ment\, n. The act of involving, or the state of being involved. --Lew Wallace.

Wikipedia Word definitions in Wikipedia