any covering for the head, especially a hat, cap, bonnet, etc.
a protective covering for the head, as a steel helmet or football helmet.
the parts of a harness about the animal's head.
Orthodontics Informal. a device worn on the head and attached by wires and elastic bands to braces in the mouth, used to create backward tension in the process of repositioning protruding teeth.
Mining. a headframe and its machinery.

1530–40; head + gear

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
headgear (ˈhɛdˌɡɪə)
1.  any head covering, esp a hat
2.  any part of a horse's harness that is worn on the head
3.  the hoisting mechanism at the pithead of a mine

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The prevalence of outlandish headgear suggests a festive atmosphere.
They identify radio-equipped headgear allowing direct communication from coach
  to player.
Headgear guaranteed to keep you cool in any weather.
Headgear to protect against rubber bullets and rocks was fashioned from
  cardboard, shoes and even stale pieces of bread.
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