11th Commandment Definition
noun
Alternative form of 11th commandment.
Wiktionary
A well-known convention (often the most well-known of a certain field) which supposedly can not or should not be broken.
Wiktionary
Origin of 11th Commandment
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In reference to the biblical Ten Commandments , carrying the implication that the convention is of very high importance (similar to the Ten Commandments).
From Wiktionary
