un·nec·es·sar·y

[uhn-nes-uh-ser-ee] adjective, noun, plural un·nec·es·sar·ies.
adjective
1.
not necessary or essential; needless; unessential.
noun
2.
unnecessaries, things that are not necessary or essential.

Origin:
1540–50; un-1 + necessary

un·nec·es·sar·i·ly [uhn-nes-uh-sair-uh-lee, -nes-uh-ser-] , adverb
un·nec·es·sar·i·ness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
unnecessary (ʌnˈnɛsɪsərɪ, -ɪsrɪ) [Click for IPA pronunciation guide]
 
adj
not necessary
 
un'necessarily
 
adv
 
un'necessariness
 
n

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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00:10
Unnecessary is always a great word to know.
So is gobo. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Etymonline
Word Origin & History

unnecessary
1548, from un- (1) "not" + necessary.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
We could continue to debate the tone of your email, but it seems unnecessary.
Any oil that doesn't run off on its own would be easily wiped away with water,
  making it unnecessary for a driver to use soap.
Here's one take on it that resolves the obvious contradiction even though such
  resolution is unnecessary.
Many firms have become nimbler by removing unnecessary bureaucracy.
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