the world > existence and causation > existence > state or condition > circumstance or circumstances > circumstance [phrase] > in case or in the event that (2)
in (also for, on, upon) adventure: in case, for fear. Cf. anaunter, adv. anauntrins, conj. enaunter, conj. Obsolete.
if case (be that): if it should prove or happen that, if perchance. Obsolete.