Go to MSN Homeencarta®
HomeEncyclopediaDictionaryAtlasK-12 SuccessCollege & Grad SchoolDegrees & TrainingQuizzesMore
Dictionary
Find
in
Dictionary
Thesaurus
Translations
ABCDEFGHIJKLMNOPQRSTUVWXYZ
Click to move up the list of words
option contract
option elasticity
option income fund
option premium
option price
option seller
option series
option writer
optional
options on physicals
opto-
optoelectronics
optometrist
optometry
optophone
opulent
opuntia
Click to move down the list of words
Print Preview
See pronunciation key
Search for "optional" in all of MSN Encarta
E-mail this entry
Blog about this entry on MSN Spaces
Download the MSN Encarta Right-Click Dictionary

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.
Advertisement

Also on Encarta
• Important Notice: MSN Encarta to be discontinued. Learn more.
• 10 tips for building your English vocabulary
• Alternatives to the M.B.A.
• GPS for students
• Making the right college choice
• Presidential Myths Quiz
• Coffee break: Recharge your brain
Englishtown: Learn English online
Our Partners
• ApplyWise Online College Admissions Counseling
• The Princeton Review
• Tutor.com: Live Help When You Get Stuck
Also on MSN
• Peek into the world of parasites on Animal Planet
• Mom's Homeroom: Learn ways to help your kid succeed in school
• MSN Shopping: Best books for the season
• MSN Careers: Nail that job interview
• Today's news on MSNBC
Encarta Message Boards (© Rubberball/Jupiterimages)
Shopping
© 2009 Microsoft