Reason

What does reason mean?

noun

1. a rational motive for a belief or action the reason that war was declared
2. an explanation of the cause of some phenomenon the reason a steady state was never reached was that the back pressure built up too slowly
3. the capacity for rational thought or inference or discrimination we are told that man is endowed with reason and capable of distinguishing good from evil

verb

1. decide by reasoning; draw or come to a conclusion We reasoned that it was cheaper to rent than to buy a house
2. present reasons and arguments
3. think logically The children must learn to reason

Definitions from WordNet 3.0, Princeton University.