Contrary to known or agreed facts; untrue.
Of or in comparison to a hypothetical state of the world.
A conditional statement in which the conditional clause is false.
A claim, hypothesis, or other belief that is contrary to the facts.
A hypothetical state of the world, used to assess the impact of an action.
Any fact or situation which is known or familiar.
A constant or variable the value of which is already determined.
Accepted, familiar, researched.
Identified as a specific type; famous, renowned.