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upload to send information from a smaller computer to a larger computer or computer network. [2 definitions]
upon on. [3 definitions]
up one's sleeve held secretly or in reserve.
upper higher in place, rank, position, or level. [2 definitions]
upper-case capital rather than lower-case.
uppermost highest in place, rank, importance, or influence. [2 definitions]
upright in a vertical or standing position. [6 definitions]
uprising the act or an instance of rebelling or rising up against authority.
uproar a loud, confused disturbance; commotion. [2 definitions]
uproot to pull up or tear out of the ground by the roots. [2 definitions]
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 to1 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.