• under - prep. below; below the surface of; less than; as
    called for by a law, agreement or system ("The river flows under the
    bridge." "Such action is not permitted under the law.")
  • 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 ("I will not go, unless the rain stops.")
  • 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 ("He said he would write to us.") or used as an object of a
    verb ("They saw us yesterday.")
  • 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