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extension rule

noun
1.
a folding rule having a sliding part equal in length to one section so as to permit exact measurement of internal dimensions.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for extension rule
  • It announced that it would waive the construction permit extension rule.
  • The agreement must include as an attachment a copy of this extension rule.

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