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opuntia
opus
opus anglicanum
opuscule
-or (1)
-or (2)
OR (1)
OR (2)
or (1)
or (2)
OR circuit
OR gate
ora
ora et labora
orach
oracle
oracular
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optional
op·tion·al [ ópshən'l, ópshnəl ]


adjective 
Definition:
 
not compulsory: left to individual choice
It comes with optional air conditioning.

op·tion·al·ly adverb
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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