Definify.com

Webster 1828 Edition

ppr.

Laying down or imagining to exist or be true; stating as a case that may be; imagining; receiving as true.

supposing

supposing ‎(plural supposings)

The act of making a supposition.
- 1837, The Dublin University Magazine
  She could have joined most comfortably in all their supposings, and suspicions, and doubts, and prognostications, but the honour of the family was too nearly concerned to allow free reins to her tongue.