trainer

[trey-ner]
noun
1.
a person or thing that trains.
2.
a staff member on an athletic team who gives first aid and therapy to injured players.
3.
a person who trains athletes; coach.
4.
a person who trains racehorses or other animals for contests, shows, or performances.
5.
an airplane or a simulated aircraft used in training aircrew members, especially pilots.

Origin:
1590–1600; train + -er1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
trainer (ˈtreɪnə)
 
n
1.  a person who trains athletes in a sport
2.  a piece of equipment employed in training, such as a simulated aircraft cockpit
3.  horse racing a person who schools racehorses and prepares them for racing
4.  (plural) an informal name for training shoes

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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Encyclopedia Britannica
Encyclopedia

trainer

in military aviation, an airplane that is designed and used to train pilots to operate advanced aircraft effectively. The complicated modern military airplane requires a high degree of skill on the part of pilots. Military training programs commonly make use of a single-engine aircraft for primary training phases, with twin-jet trainers for transition stages

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Lois is a part-time swim instructor and personal trainer.
The trainer trains the docile horse to turn, with his sensitive neck, whichever
  way the rider indicates.
She was an avid rider and trainer, and built the barns and track that still are
  there today.
He can fire his personal trainer or check out of the clinic.
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