INSESSION

In‐ses″sion (?), n. [[L. insessio, fr. insidere, insessum, to sit in. See Insidious.]] 1. 1. The act of sitting, as in a tub or bath. “Used by way of fomentation, insession, or bath.” Holland.
2. 2. That in which one sits, as a bathing tub.
Insessions be bathing tubs half full. Holland.