united states customary system

Science Dictionary
United States Customary System   (y-nī'tĭd)  Pronunciation Key 
See US Customary System.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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WordNet
united states customary system

noun
the system of weights and measures based on the foot and pound and second and pint that dates back to colonial America but differs in some respects from the British Imperial System; today in the United States this system exists side by side with the SI system 
WordNet® 3.0, © 2006 by Princeton University.
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