reason

[ US /ˈɹizən/ ]
[ UK /ɹˈiːzən/ ]

NOUN

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
a justification for something existing or happening
they had good reason to rejoice
he had no cause to complain
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
a fact that logically justifies some premise or conclusion
there is reason to believe he is lying
a rational motive for a belief or action
the reason that war was declared
the grounds for their declaration
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

VERB

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

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How To Use reason In A Sentence

If we have spent several class periods introducing conventions of reasoned evidence in argumentative writing, we usually look for such features in student papers.
If you accept that you have to do mass education - and, to keep costs low and for a lot of other reasons, I think that's not an unreasonable conclusion - you have to systematize it.
Email and Net abuse at work have become the number one reason why UK employees face the sack, according to a survey out today.
I don't otherwise want to move: I have a large place in a convenient location with reasonable rent that allows pets, which isn't easy to find.
I think the argument of race as a cause of criminality like Walter brings up is somewhat off-point - The reason why those racial divides in criminality show up is mainly because those lines go together with education - or rather: the lack of good education. Can a Godless Society be a
That's pretty reasonable for being a motoring eco warrior. The Sun
For no apparently good reason, she told me that she hates the word "coochie" just as much as she hates the word cunt, maybe more. Drbigbeef Diary Entry
This is criminal negligence at best or treason at worst. The Sun
But the initial reason was unascertained and needed further investigation, particularly a toxicology report. Times, Sunday Times
No reasonable person wants animals to suffer. Times, Sunday Times