participation
     n 1: the act of sharing in the activities of a group; "the
          teacher tried to increase his students' engagement in
          class activities" [syn: {engagement}, {involvement}, {involution}]
          [ant: {non-engagement}, {non-engagement}, {non-engagement}]
     2: the condition of sharing in common with others (as fellows
        or partners etc.) [syn: {involvement}]
Source: WordNet® 2.0