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urge to push or drive forward or onward. [4 definitions]
urgent needing immediate action or attention. [2 definitions]
urine a substance made by the kidneys to carry waste out of the body. Urine comes out as a yellow liquid in mammals and as a partially solid substance in reptiles and birds.
URL the address of documents on the World Wide Web. URL is an abbreviation for uniform resource locator.
urn a large vase with a base. [2 definitions]
Ursa Major a constellation in the northern sky, also called the Big Dipper.
Ursa Minor a constellation in the northern sky, also called the Little Dipper.
Uruguay a country in southeastern South America. Montevideo is the capital of Uruguay.
U.S. an abbreviation for United States.
us the person speaking or writing together with another or others (a form of "we" used as the object of a verb or preposition.) [2 definitions]
U.S.A. an abbreviation for United States of America.
usable able or fit for being used.
usage way or manner of using or treating something. [2 definitions]
USDA the government agency responsible for regulations on the safety of food. USDA is an abbreviation for the United States Department of Agriculture.
use to bring into service. [9 definitions]
used having been owned by someone else; not new. [2 definitions]
useful able to be used in a helpful, practical, or effective way.
useless having no good or practical purpose.
user one that uses. [2 definitions]
user-friendly easy to use or easy to learn how to use.
use up to use all of; finish.