If you want a really popular one, look at "apportionment clause". More verification coming up.

Usually from Spanish into English, for legal and other terms, words that look alike are not good translations of each other.

apportionment - [ Traduire cette page ]
... Under the the most common apportionment clause, policy A pays 10% of any loss ($10,000 ÷ $100,000), policy B pays 20%, and policy C pays 70%. ...
insurance.cch.com/rupps/apportionment.htm

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Note added at 18 mins (2003-09-12 06:01:00 GMT)
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Here\'s the Spanish from Farmers Insurance glossary:
http://www.segurosfarmers.com/Esp/glossary/ESP_glossaryC.jsp
cláusula de prorrateo: Dispone que si existe otro seguro para cubrir la pérdida, la póliza que incluye esta cláusula no pagará ninguna cantidad superior a su parte prorrateada de la pérdida.

Here\'s the English:
http://insurance.cch.com/rupps/apportionment.htm
apportionment
A provision for dividing a loss among insurance policies when more than one policy is in force. It provides that a loss will be divided proportionally among the policies.

Strikingly similar, aren\'t they?

Hope that helps, Jerome.




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Note added at 22 mins (2003-09-12 06:05:01 GMT)
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Of course, \"pro rata clause\" CAN also mean the same thing. It is just not as commonly used. And it has multiple meanings, one of which is:

pro rata clause
A provision in a property policy which states that the insurance which has been written \"blanket,\" or as one amount covering several items, shall be limited on each item to the proportionate amount which the value of the particular item bears to the total value of all insured items.