1. universal donor a person whose type O Rh-negative blood may be safely transfused into persons with other blood types
  2. infrastructure the basic features of a system or organization
  3. understatement something said in a restrained way for ironic contrast
  4. university student a student enrolled in a college or university
  5. universal agent someone authorized to transact every kind of business for the principal
  6. universal quantifier a logical quantifier of a proposition that asserts that the proposition is true for all members of a class of things
  7. universal joint coupling that connects two rotating shafts allowing freedom of movement in all directions
  8. university extension an educational opportunity provided by colleges and universities to people who are not enrolled as regular students
  9. inference a conclusion you can draw based on known evidence
  10. understated exhibiting restrained good taste
  11. unfortunately by bad luck
  12. inverse tangent the inverse function of the tangent
  13. University of Nebraska a university in Lincoln, Nebraska
  14. University of Paris a university in Paris; intellectual center of France
  15. inverse secant the inverse function of the secant
  16. University of Washington a university in Seattle, Washington
  17. universal time the local time at the 0 meridian passing through Greenwich, England; it is the same everywhere
  18. overstatement exaggeration of the importance or extent of something
  19. anniversary the date on which an event occurred in some previous year
  20. universal set (mathematics) the set that contains all the elements or objects involved in the problem under consideration