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optional

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Option
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op⋅tion⋅al

  [op-shuh-nl]
Use optional in a Sentence
–adjective
1. left to one's choice; not required or mandatory: Formal dress is optional.
2. leaving something to choice.
Origin:
1755–65; option + -al 1

Related forms:
op⋅tion⋅al⋅i⋅ty, noun
op⋅tion⋅al⋅ly, adverb

Synonyms:
1. discretional, elective, voluntary.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Option
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op·tion·al   (ŏp'shə-nəl)   
adj.  Left to choice; not compulsory or automatic.
op'tion·al·ly adv.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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