Inclusion/ɪnˈkluːʒn/ Definition 1 of 4Pro Tip 1/3Group Unity Reflects the act of creating a sense of group unity by accepting new members or ideas. The inclusion of everyone's opinions made the decision fair. Pro Tip 2/3Unexpected Addition Can express surprise when someone or something is added unexpectedly. Her sudden inclusion in the team puzzled us. Pro Tip 3/3Feeling Welcomed Used to describe the pleasant feeling of being welcomed into a larger group. His warm inclusion into the club made him very happy.