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Definition of reason:

  1. 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.
  2. Hence: To carry on a process of deduction or of induction, in order to convince or to confute; to formulate and set forth propositions and the inferences from them; to argue.
  3. Ratio; proportion.
  4. The faculty or capacity of the human mind by which it is distinguished from the intelligence of the inferior animals; the higher as distinguished from the lower cognitive faculties, sense, imagination, and memory, and in contrast to the feelings and desires. Reason comprises conception, judgment, reasoning, and the intuitional faculty. Specifically, it is the intuitional faculty, or the faculty of first truths, as distinguished from the understanding, which is called the discursive or ratiocinative faculty.
  5. 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.
  6. To converse; to compare opinions.
  7. 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.
  8. To find by logical processes; to explain or justify by reason or argument; - usually with out; as, to reason out the causes of the librations of the moon.
  9. To overcome or conquer by adducing reasons; - with down; as, to reason down a passion.
  10. To persuade by reasoning or argument; as, to reason one into a belief; to reason one out of his plan.
  11. To support with reasons, as a request.

Synonyms:

agreement, argument, plan, suit, tenableness, defense, acumen, priming coat, aim, former, intellect, judgment, creator, practical, indicate, sense, basis, causal agent, clarity, mature, source, discernment, warrant, origin, on account of, moderateness, yard, precedent, explain, effort, wherefore, apprehension, subject, modestness, background, fountain, solid ground, movement, for, condition, authority, intellection, foundation, logical, design, pragmatic, argue, marble, soundness, accounting, smarts, primer coat, designer, motive, causality, rationalism, author, footing, ratiocination, in justification of something, lawsuit, head, curtilage, why, ground, resolve, fence, goal, causa, end, it's a long story, realistic, soil, common sense, brainpower, clear-headed, intent, cause, point, gray matter, don't ask, spring, originator, argumentation, necessity, headpiece, rationality, proof, think over, sensible, contend, intellectuality, motivation, vision, balanced, skip it, rational, grounded, impetus, intuition, call, land, occasion, lucidity, close, wisdom, agent, reason out, don't remind me, grounds, conclude, campaign, undercoat, reasonableness, saneness, account, terra firma, causal agency, think out, because, start, brilliance, dry land, flat coat, speculation, lucidness, primer, power, actor, wit, antecedent, intention, keep it simple, sympathy, causation, incentive, rationalness, daylights, priming, understanding, by way of, intellectual, marbles, true, sane, perish the thought, root, purpose, rationalization, tenability, drive, evidence, earth, sanity, crusade, explanation, take a long hard look at someone/something, take something into consideration, savvy, idea, case, assess, apology, object.

Usage examples:

  • What's the reason I can't go?"

    - "The Landlord at Lion's Head, Complete", William Dean Howells Last Updated: February 27, 2009.
  • I will reason with him."

    - "A Tale of a Lonely Parish", F. Marion Crawford.
  • The reason she had so many children was because she was poor.

    - "Little Mr. Thimblefinger and His Queer Country", Joel Chandler Harris.