under [(1) below; (2) below the surface of; (3) less than; (4) as called for by a law, agreement or system] The river flows under the bridge. (1) The submarine went under. (2) The book was under 20 dollars. (3) Such action is not permitted under the law. (4) understand [(1) to know what is meant; (2)to have knowledge of] I understand what you mean. (1) He understands chemistry. (2) unite [to join together] The new president will try to unite all parties in support of his program. universe [all of space, including planets and stars] Do you know why the universe is expanding?
university [a place of education that usually includes several colleges and research organizations] Her sons are students at different universities.
unless [(1) except if it happens; (2) on condition that] I will not go, unless the rain stops. (1) I will come to your house unless it rains. (2) until [(1) up to a time; (2) before] She said she would wait for me until three o'clock. (1) We cannot start until everyone arrives. (2) up [to, in or at a higher position or value] We will walk up the stairs. urge [(1) to advise strongly; (2) to make a great effort to get someone to do something] He urged the governor to think carefully before signing such a bill. (1) The speaker urged the crowd to take control of the university. (2) urgent [needing an immediate decision or action] She said urgent action is necessary. us [(1) the form of the word "we" used after a preposition; (2) or used as an object of a verb] He said he would write to us. (1) They saw us yesterday. (2) use [(1) to employ for a purpose; (2) to put into action] We use electricity to light our house. (1) He used a piece of glass to cut the ropes that tied our hands. (2) usual [(1) as is normal or common; (2) as is most often done, seen or heard] They watched all the usual television shows. (1) We left for work at our usual time. (2)
