U

　　understand - v. to know what is meant; to have knowledge of

　　unite - v. to join together

　　universe - n. all of space, including planets and stars

　　university - n. a place of education that usually includes several colleges and research organizations

　　unless - conj. except if it happens; on condition that

　　until - conj. up to a time; before

　　up - ad. to, in or at a higher position or value

　　urge - v. to advise strongly; to make a great effort to get someone to do something

　　urgent - ad. needing an immediate decision or action

　　us - pro. the form of the word we used after a preposition or used as an object of a verb

　　use - v. to employ for a purpose; to put into action

　　usual - ad. as is normal or common; as is most often done, seen or heard