A reason explains why you do something. The reason you go to school is to learn things (and because it's the law).

Reason usually has to do with thought and logic, as opposed to emotion. If people think you show good reason, or are reasonable, it means you think things through. If people think you have a good reason for doing something, it means you have a motive that makes sense. Reason can also be a verb. You might reason something out, which means that you look at all sides of the issue and then and decide what to do.

Definitions of reason

n a rational motive for a belief or action

“the reason that war was declared”
a reason
account, score
wherefore, why
the cause or intention underlying an action or situation, especially in the phrase `the whys and wherefores'
Type of:
rational motive
a motive that can be defended by reasoning or logical argument

n a fact that logically justifies some premise or conclusion

“there is reason to believe he is lying”
(medicine) a reason to prescribe a drug or perform a procedure
(medicine) a reason that makes it inadvisable to prescribe a particular drug or employ a particular procedure or treatment
Type of:
a piece of information about circumstances that exist or events that have occurred

n a justification for something existing or happening

“they had good reason to rejoice”
cause, grounds
Type of:
a statement in explanation of some action or belief

n 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”
Type of:
account, explanation
a statement that makes something comprehensible by describing the relevant structure or operation or circumstances etc.

n 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”
intellect, understanding
Type of:
faculty, mental faculty, module
one of the inherent cognitive or perceptual powers of the mind

n the state of having good sense and sound judgment

“he had to rely less on reason than on rousing their emotions”
rationality, reasonableness
Type of:
saneness, sanity
normal or sound powers of mind

v decide by reasoning; draw or come to a conclusion

“We reasoned that it was cheaper to rent than to buy a house”
conclude, reason out
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reason or establish by induction
deduce, deduct, derive, infer
reason by deduction; establish by deduction
syllogise, syllogize
reason by syllogisms
feel, find
come to believe on the basis of emotion, intuitions, or indefinite grounds
deduce, infer
conclude by reasoning; in logic
conclude from evidence
extrapolate, generalise, generalize, infer
draw from specific cases for more general cases
gain knowledge of (an area not known or experienced) by extrapolating
infer from incomplete evidence
derive by reason
overgeneralise, overgeneralize
draw too general a conclusion
universalise, universalize
make universal
Type of:
cerebrate, cogitate, think
use or exercise the mind or one's power of reason in order to make inferences, decisions, or arrive at a solution or judgments

v think logically

“The children must learn to reason
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rationalise away, rationalize away
substitute a natural for a supernatural explanation of
form or construct theories
construct a theory about
reason methodologically and logically
calculate, cipher, compute, cypher, figure, reckon, work out
make a mathematical calculation or computation
categorise, categorize
place into or assign to a category
talk over conjecturally, or review in an idle or casual way and with an element of doubt or without sufficient reason to reach a conclusion
quantise, quantize
apply quantum theory to; restrict the number of possible values of (a quantity) or states of (a physical entity or system) so that certain variables can assume only certain discrete magnitudes that are integral multiples of a common factor
calculate the root of a number
perform mathematical and logical operations on (data) according to programmed instructions in order to obtain the required information
divide or assess proportionally
miscalculate, misestimate
calculate incorrectly
calculate anew
average, average out
compute the average of
factor, factor in, factor out
resolve into factors
add, add together
make an addition by combining numbers
deduct, subtract, take off
make a subtraction
combine by multiplication
divide, fraction
perform a division
extrapolate, interpolate
estimate the value of
calculate a derivative; take the derivative
calculate the integral of; calculate by integration
plot a map of (land)
assort, class, classify, separate, sort, sort out
arrange or order by classes or categories
approximate, estimate, gauge, guess, judge
judge tentatively or form an estimate of (quantities or time)
make a budget
capitalise, capitalize
compute the present value of a business or an income
resolve, solve
find the solution
guess, hazard, pretend, venture
put forward, of a guess, in spite of possible refutation
say, suppose
express a supposition
Type of:
cerebrate, cogitate, think
use or exercise the mind or one's power of reason in order to make inferences, decisions, or arrive at a solution or judgments

v present reasons and arguments

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argue again
reason with (somebody) for the purpose of dissuasion
defend, fend for, support
argue or speak in defense of
apologise, apologize, excuse, justify, rationalise, rationalize
defend, explain, clear away, or make excuses for by reasoning
stand up, stick up
defend against attack or criticism
stand up for; stick up for; of causes, principles, or ideals
Type of:
lay out, present, represent
bring forward and present to the mind

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