As a Noun: 1. The act of taking part in something. English = involvement, participation 2. The act of being part of something else. English = inclusion. As a Verb or Adjective: 1. Of an object, situation or activity, to have something else as one of its parts. English = include. 2. Of something in a situation or activity, to be a necessary part or to be affected by the situation or activity. English = involve. 3. To take part in some activity; to be a part of something else. English = participate, (be) involved in; (be) included in. 4. Of things in a task, situation, or system, to be required in order to achieve it or to understand it and the problems that it causes. English = (be) involved.