and/or

American  

[and-awr] / ˈændˈɔr /

conjunction

1. (used to imply that either or both of the things mentioned may be affected or involved).

   insurance covering fire and/or wind damage.

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and/or British  

conjunction

1. (coordinating) used to join terms when either one or the other or both is indicated

   passports and/or other means of identification

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and/or Idioms  

1. 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.

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Usage

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?

Many people think that and/or is only acceptable in legal and commercial contexts. In other contexts, it is better to use or both: some alcoholics lose their jobs or their driving licences or both (not their jobs and/or their driving licences )

Example Sentences

Forecasters at the National Weather Service warned of flooding and said parked cars near the waterfront “will likely become flooded and/or submerged.”

From The Wall Street Journal

Here’s the bottom line: Most states that carry an inheritance tax exempt spouses and, relevant in your case, children, and/or they provide generous credits.

From MarketWatch

Second, did they wilfully neglect to perform their duty and/or wilfully misconduct themselves?

From BBC

In a statement, FIS told BBC Sport: "For athletes who choose to compete in multiple disciplines and/or multiple events, conflicts can sometimes be inevitable."

From BBC

That’s manipulative and, given that you are now divorced, this seems like another way to have a financial and/or emotional hold over you.

From MarketWatch