con·di·tion·er

[kuhn-dish-uh-ner]
noun
1.
a person or thing that conditions.
2.
something added to a substance to increase its usability, as a water softener.
3.
a cream or liquid preparation applied to the hair or skin, especially for its emollient qualities.
4.
a trainer of athletes.
6.
Textiles. a person who conditions fibers or fabrics.

Origin:
1590–1600; condition + -er1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To conditioner
00:10
Conditioner is always a great word to know.
So is doohickey. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a gadget; dingus; thingumbob.
Collins
World English Dictionary
conditioner (kənˈdɪʃənə) [Click for IPA pronunciation guide]
 
n
1.  a person or thing that conditions
2.  a substance, esp a cosmetic, applied to something to improve its condition: hair conditioner

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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Etymonline
Word Origin & History

conditioner
c.1600, "a bargainer," from condition. Meaning "an agent that brings something into good condition" is from 1888; since c.1960 usually in ref. to hair care products. For about 20 years before that, it often was short for air conditioner.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Keep those fans buzzing in summer instead of turning on the air conditioner.
Ducts that move air to-and-from a forced air furnace, central air conditioner,
  or heat pump are often big energy wasters.
Around midday, the cooling mode kicks in, and the device shuts off the
  building's regular air conditioner for a six-hour cycle.
Look for preseason air conditioner sales and do advance work for next month's
  gift buying.
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