[ree-zuh-nuh-buhl, reez-nuh-]
agreeable to reason or sound judgment; logical: a reasonable choice for chairman.
not exceeding the limit prescribed by reason; not excessive: reasonable terms.
moderate, especially in price; not expensive: The coat was reasonable but not cheap.
endowed with reason.
capable of rational behavior, decision, etc.

1250–1300; Middle English resonable < Middle French raisonnable < Latin ratiōnābilis. See reason, -able

reasonableness, reasonability, noun
reasonably, adverb
half-reasonable, adjective
half-reasonably, adverb
nonreasonability, noun
nonreasonable, adjective
nonreasonableness, noun
nonreasonably, adverb
quasi-reasonable, adjective
quasi-reasonably, adverb

rational, reasonable (see synonym study at the current entry).

1. intelligent, judicious, wise, equitable. Reasonable, rational refer to the faculty of reasoning. Rational can refer to the reasoning faculty itself or to something derived from that faculty: rational powers; a rational analysis. It can also mean sane or sensible: She was no longer rational; a rational plan. Reasonable most often means sensible: A reasonable supposition is one which appeals to our common sense. 2. equitable, fair, just. See moderate. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
reasonable (ˈriːzənəbəl)
1.  showing reason or sound judgment
2.  having the ability to reason
3.  having modest or moderate expectations; not making unfair demands
4.  moderate in price; not expensive
5.  fair; average: reasonable weather

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1300, "having sound judgment, sane, rational," from O.Fr. raisonable, from L. rationabilis, from ratio (see ratio).
"What the majority of people consider to be 'reasonable' is that about which there is agreement, if not among all, at least among a substantial number of people; 'reasonable' for most people, has nothing to do with reason, but with consensus." [Erich Fromm]
Meaning "moderate in price" is recorded from 1667.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Our power is in the reasonableness of our recommendations.
The state controls the purse and the state does not wish to have students even
  question the reasonableness of laws enacted by it.
It is not in fact a standard of reasonableness or truth or objectivity.
The problems that these two regulations run into may differ in part due to
  their relative reasonableness.
Related Words
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