verb (used with object)
to act or behave toward (a person) in some specified way: to treat someone with respect.
to consider or regard in a specified way, and deal with accordingly: to treat a matter as unimportant.
to deal with (a disease, patient, etc.) in order to relieve or cure.
to deal with in speech or writing; discuss.
to deal with, develop, or represent artistically, especially in some specified manner or style: to treat a theme realistically.
to subject to some agent or action in order to bring about a particular result: to treat a substance with an acid.
to entertain; give hospitality to: He treats diplomats in the lavish surroundings of his country estate.
to provide food, entertainment, gifts, etc., at one's own expense: Let me treat you to dinner.
verb (used without object)
to deal with a subject in speech or writing; discourse: a work that treats of the caste system in India.
to give, or bear the expense of, a treat: Is it my turn to treat?
to carry on negotiations with a view to a settlement; discuss terms of settlement; negotiate.
entertainment, food, drink, etc., given by way of compliment or as an expression of friendly regard.
anything that affords particular pleasure or enjoyment.
the act of treating.
one's turn to treat.

1250–1300; Middle English treten (v.) < Old French tretier, traitier < Latin tractāre to drag, handle, treat, frequentative of trahere to drag. See tract1

treater, noun
nontreated, adjective
overtreat, verb
self-treated, adjective
untreated, adjective
well-treated, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
treat (triːt)
1.  a celebration, entertainment, gift, or feast given for or to someone and paid for by another
2.  any delightful surprise or specially pleasant occasion
3.  the act of treating
vb (usually foll by of)
4.  (tr) to deal with or regard in a certain manner: she treats school as a joke
5.  (tr) to apply treatment to: to treat a patient for malaria
6.  (tr) to subject to a process or to the application of a substance: to treat photographic film with developer
7.  (tr; often foll by to) to provide (someone) (with) as a treat: he treated the children to a trip to the zoo
8.  formal to deal (with), as in writing or speaking
9.  formal (intr) to discuss settlement; negotiate
[C13: from Old French tretier, from Latin tractāre to manage, from trahere to drag]

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, "negotiate, bargain, deal with," from O.Fr. traitier (12c.), from L. tractare "manage, handle, deal with," originally "drag about," frequentative of trahere (pp. tractus) "to pull, draw" (see tract (1)). Meaning "to entertain with food and drink by way of compliment
or kindness (or bribery)" is recorded from c.1500. Sense of "deal with in speech or writing" (early 14c.) led to the use in medicine (1781), "to attempt to heal or cure." The noun is first recorded late 14c., "action of discussing terms;" sense of "a treating with food and drink" (1650s) was extended by 1770 to "anything that gives pleasure." Treatment "conduct, behavior" is recorded from c.1560; in the medical sense, it is first recorded 1744.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

treat (trēt)
v. treat·ed, treat·ing, treats

  1. To give medical aid to someone.

  2. To give medical aid to counteract a disease or condition.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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