From The Collaborative International Dictionary of English v.0.48:

Optional \Op"tion*al\, a.
   Involving an option; depending on the exercise of an option;
   left to one's discretion or choice; allowed but not
   compulsory; as, optional studies; it is optional with you to
   go or stay. -- n. See Elective, n.
   [1913 Webster]

         If to the former the movement was not optional, it was
         the same that the latter chose when it was optional.
   [1913 Webster]

         Original writs are either optional or peremptory.
   [1913 Webster]
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