Verbal and logic

supposition
(n)
supp-ǝ-ZISH-ǝn
Meaning

hypothesis; surmise; guess

1st Sample Sentence

On the mistaken supposition that the class was held on Wednesdays, I arrived at the lecture hall to find it empty.

Root

sub (under, up to)#ponere (to put, place) (Latin)

Mnemonics

Similar to "SUPPOSE".