|I don't have Rand's definitions of "reason," "rationality" or "logic" at hand, but I'm confident somebody will quote them for us.|
Reason is a faculty of certain organisms, and rationality is a character trait. Neither is a process, though reasoning is.
We determine many facts by direct observation, not deduction. Where we aren't deducing, premises don't come into the picture. In the cases where you do use premises, reason is what enabled you to determine that they're true. Though I haven't worked it out, I suspect that your proposed definition would lead to circularity or infinite regress.
(Edited by Peter Reidy on 7/12, 4:19pm)