English to English
1. a rational motive for a belief or action
the reason that war was declared|the grounds for their declaration
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
4. the state of having good sense and sound judgment
his rationality may have been impaired|he had to rely less on reason than on rousing their emotions
5. a justification for something existing or happening
he had no cause to complain|they had good reason to rejoice
6. a fact that logically justifies some premise or conclusion
there is reason to believe he is lying
7. A thought or a consideration offered in support of a determination or an opinion; a just ground for a conclusion or an action; that which is offered or accepted as an explanation; the efficient cause of an occurrence or a phenomenon; a motive for an action or a determination; proof, more or less decisive, for an opinion or a conclusion; principle; efficient cause; final cause; ground of argument.
8. decide by reasoning; draw or come to a conclusion
We reasoned that it was cheaper to rent than to buy a house
9. present reasons and arguments
10. think logically
The children must learn to reason
11. To exercise the rational faculty; to deduce inferences from premises; to perform the process of deduction or of induction; to ratiocinate; to reach conclusions by a systematic comparison of facts.
12. To arrange and present the reasons for or against; to examine or discuss by arguments; to debate or discuss; as, I reasoned the matter with my friend.