Premise
From Wikinfo
A premise (sometimes spelled "premiss" in philosophy) is a statement, usually put forth as part of a logical argument, that will be presumed true for the purposes of that argument. Naturally, the accuracy of a given conclusion is dependent on the truth of the chosen premises.
See also:
Premises are land and buildings together considered as a place of business.
References
- Adapted from the Wikipedia article, "Premise" http://en.wikipedia.org/wiki/Premise, used under the GNU Free Documentation License