1. first class mail that includes letters and postcards and packages sealed against inspection
  2. first-class very good;of the highest quality
  3. first cause an agent that is the cause of all things but does not itself have a cause
  4. tourist class inexpensive accommodations on a ship or train
  5. world-class ranking above all others
  6. word class one of the traditional categories of words intended to reflect their functions in a grammatical context
  7. first-class mail mail that includes letters and postcards and packages sealed against inspection
  8. first blush at the first glimpse or impression
  9. fruticulose of or relating to or resembling a shrub
  10. first lady the wife of a chief executive
  11. first base the base that must be touched first by a base runner in baseball
  12. form class one of the traditional categories of words intended to reflect their functions in a grammatical context
  13. art class a class in which you learn to draw or paint
  14. 1st class mail that includes letters and postcards and packages sealed against inspection
  15. first cousin the child of your aunt or uncle
  16. first floor the floor of a building that is at or nearest to the level of the ground around the building
  17. third class inexpensive accommodations on a ship or train
  18. First Crusade a Crusade from 1096 to 1099
  19. field glass a small refracting telescope
  20. flint glass optical glass of high dispersion and high refractive index