optional
American Heritage Dictionary:
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op·tion·al
(ŏp'shə-nəl) 
adj.
Left to choice; not compulsory or automatic.
optionally op'tion·al·ly adv.
adj.
Left to choice; not compulsory or automatic.
optionally op'tion·al·ly adv.
Roget's Thesaurus:
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optional
Antonyms by Answers.com:
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optional
adj
Definition: possible; available as choice
Antonyms: compulsory, forced, mandatory, obligatory, required
Translations:
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Optional
Dansk (Danish)
adj. - valgfri, frivilligt
Nederlands (Dutch)
facultatief, niet verplicht
Français (French)
adj. - facultatif, au choix, en option
Deutsch (German)
adj. - fakultativ, wahlfrei, freiwillig
Ελληνική (Greek)
adj. - προαιρετικός, κατ' εκλογήν
Italiano (Italian)
facoltativo
Português (Portuguese)
adj. - opcional
Русский (Russian)
по выбору, необязательный
Español (Spanish)
adj. - facultativo, opcional, potestativo, optativo
Svenska (Swedish)
adj. - valfri, frivillig
中文（简体）(Chinese (Simplified))
可选择的, 随意的
中文（繁體）(Chinese (Traditional))
adj. - 可選擇的, 隨意的
日本語 (Japanese)
adj. - 自由に選択できる, 任意の, 選択の
العربيه (Arabic)
(صفه) اختياري
עברית (Hebrew)
adj. - לא חובה, של בחירה
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Copyrights:
American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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Roget's Thesaurus
Roget's II: The New Thesaurus, Third Edition by the Editors of the American Heritage® Dictionary Copyright © 1995 byHoughton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
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