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