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optional: Meaning and Definition of

op•tion•al

Pronunciation: (op'shu-nl), [key]
— adj.
  1. left to one's choice; not required or mandatory: Formal dress is optional.
  2. leaving something to choice.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also:
option optionee
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