WordReference Random House Learner's Dictionary of American English © 2017
rea•son /ˈrizən/USA pronunciation   n. 
  1. a basis or cause, as for some belief, action, fact, or event:[countable]a good reason for declaring war.
  2. [countable] a statement presented in explaining a belief or action.
  3. the mental powers concerned with forming conclusions and judgments:[uncountable]Animals do not possess reason.
  4. sound judgment;
    good sense:[uncountable]won't listen to reason.

  1. to think or argue in a logical manner: [no object]Animals cannot reason.[+ object]didn't reason things out.
  2. to form conclusions or judgments from facts:[+ (that) clause]I reasoned that he must have fallen and hit his head.
  1. Idiomsby reason of, on account of;
    because of.
  2. Idiomsin or within reason, within reasonable limits:We'll pay if the cost is within reason.
  3. Idiomswith reason, with ample justification:She doesn't like me, and with reason.

rea•son•er, n. [countable]

WordReference Random House Unabridged Dictionary of American English © 2017
rea•son  (rēzən),USA pronunciation n. 
  1. a basis or cause, as for some belief, action, fact, event, etc.:the reason for declaring war.
  2. a statement presented in justification or explanation of a belief or action.
  3. the mental powers concerned with forming conclusions, judgments, or inferences.
  4. sound judgment;
    good sense.
  5. normal or sound powers of mind;
  6. Philosophy[Logic.]a premise of an argument.
  7. Philosophy
    • the faculty or power of acquiring intellectual knowledge, either by direct understanding of first principles or by argument.
    • the power of intelligent and dispassionate thought, or of conduct influenced by such thought.
    • [Kantianism.]the faculty by which the ideas of pure reason are created.
  8. bring (someone) to reason, to induce a change of opinion in (someone) through presentation of arguments;
    convince:The mother tried to bring her rebellious daughter to reason.
  9. by reason of, on account of;
    because of:He was consulted about the problem by reason of his long experience.
  10. in or  within reason, in accord with reason;
    proper:She tried to keep her demands in reason.
  11. stand to reason, to be clear, obvious, or logical:With such an upbringing it stands to reason that the child will be spoiled.
  12. with reason, with justification;
    properly:The government is concerned about the latest crisis, and with reason.

  1. to think or argue in a logical manner.
  2. to form conclusions, judgments, or inferences from facts or premises.
  3. to urge reasons which should determine belief or action.

  1. to think through logically, as a problem (often fol. by out).
  2. to conclude or infer.
  3. to convince, persuade, etc., by reasoning.
  4. to support with reasons.
reason•er, n. 
  • Latin ratiōn- (stem of ratiō) ratio
  • Old French reisun, reson
  • Middle English resoun, reisun (noun, nominal) 1175–1225
    • 1.See corresponding entry in Unabridged purpose, end, aim, object, objective.
      Reason, cause, motive are terms for a circumstance (or circumstances) which brings about or explains certain results. A
      reason is an explanation of a situation or circumstance which made certain results seem possible or appropriate:The reason for the robbery was the victim's display of his money.The
      cause is the way in which the circumstances produce the effect, that is, make a specific action seem necessary or desirable:The cause was the robber's extreme need of money.A
      motive is the hope, desire, or other force which starts the action (or an action) in an attempt to produce specific results:The motive was to get money to buy food for his family.
    • 2.See corresponding entry in Unabridged excuse, rationalization.
    • 3.See corresponding entry in Unabridged understanding, intellect, mind, intelligence.
    • 15.See corresponding entry in Unabridged persuade.
    The construction reason is because is criticized in a number of usage guides:The reason for the long delays was because the costs greatly exceeded the original estimates.One objection to this construction is based on its redundancy: the word because (literally, by cause) contains within it the meaning of reason;
    thus saying the reason is because is like saying "The cause is by cause,'' which would never be said. A second objection is based on the claim that because can introduce only adverbial clauses and that reason is requires completion by a noun clause. Critics would substitute that for because in the offending construction:The reason for the long delays in completing the project was that the costs. …Although the objections described here are frequently raised, reason is because is still common in almost all levels of speech and occurs often in edited writing as well.A similar charge of redundancy is made against the reason why, which is also a well-established idiom:The reason why the bill failed to pass was the defection of three key senators.

Collins Concise English Dictionary © HarperCollins Publishers::

reason /ˈriːzən/ n
  1. the faculty of rational argument, deduction, judgment, etc
  2. sound mind; sanity
  3. a cause or motive, as for a belief, action, etc
  4. an argument in favour of or a justification for something
  5. the intellect regarded as a source of knowledge, as contrasted with experience
  6. grounds for a belief; a premise of an argument supporting that belief
  7. by reason ofbecause of
  8. in reason, within reasonwithin moderate or justifiable bounds
  9. it stands to reasonit is logical or obvious
  10. listen to reasonto be persuaded peaceably
  11. reasons of Statepolitical justifications for an immoral act
  1. (when tr, takes a clause as object) to think logically or draw (logical conclusions) from facts or premises
  2. (intransitive) usually followed by with: to urge or seek to persuade by reasoning
  3. (transitive) often followed by out: to work out or resolve (a problem) by reasoning
Etymology: 13th Century: from Old French reisun, from Latin ratiō reckoning, from rērī to think

ˈreasoner n USAGE
The expression the reason is because… should be avoided. Instead one should say either this is because… or the reason is that…

'reasons' also found in these entries:

Forum discussions with the word(s) "reasons" in the title:

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