D defs.my
Entry 2 senses Webster, 1913

Insession

· In·ses·sion · IPA /ɪnˈsɛʃən/
01 n. The act of sitting, as in a tub or bath.
  1. 1.
    The act of sitting, as in a tub or bath.[R.]
  2. 2.
    That in which one sits, as a bathing tub.[R.]
    Insessions be bathing tubs half full.” Holland.