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and/or

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and/or

[and-awr]
–conjunction
(used to imply that either or both of the things mentioned may be affected or involved): insurance covering fire and/or wind damage.

The combination and/or is used primarily in business and legal writing: All dwellings and/or other structures on the property are included in the contract. Because of these business and legal associations, some object to the use of this combination in general writing, where it occasionally occurs: She spends much of her leisure time entertaining and/or traveling. In such writing, either and or or is usually adequate. If a greater distinction is needed, another phrasing is available: Would you like cream or sugar, or both?
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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and/or   (ān'dôr')   
conj.  Used to indicate that either or both of the items connected by it are involved.
Usage Note: And/or is widely used in legal and business writing. Its use in general writing to mean "one or the other or both" is acceptable but can appear stilted. See Usage Note at or1.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Idioms & Phrases

and/or

Both or either of two options. For example, His use of copyrighted material shows that the writer is careless and/or dishonest. This idiom originated in legal terminology of the mid-1800s.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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