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upset to tip or turn over. [9 definitions]
upside down with the part that is usually underneath on top; inverted.
upstairs on or toward an upper floor; up the stairs. [3 definitions]
up to busy with; doing. [3 definitions]
up-to-date having the most recent information; current. [2 definitions]
upward toward or to a higher position or place. [2 definitions]
Ural Mountains a mountain range in Russia, extending from the Arctic Ocean to near the Caspian Sea and forming a border between Europe and Asia; Urals.
uranium a heavy, silver-white radioactive metal that is one of the chemical elements. It is used to produce nuclear energy. (symbol: U)
Uranus the third largest planet in the solar system and seventh in distance from the sun. [2 definitions]
urban of or having to do with a city or town.
Urdu the main language of Pakistan and one of the important languages spoken in India. Spoken Urdu is similar to Hindi, a major language of India, but its way of writing is completely different and not all of the words are the same.
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]