1. The act of involving or infolding. 2. The state of being entangled or involved; complication; entanglement. All things are mixed, and causes blended, by mutual involutions. Glanvill. 3. That in which anything is involved, folded, or wrapped; envelope. Sir T. Browne. 4. (Gram.) The insertion of one or more clauses between the subject and the verb, in a way that involves or ...