1. juxtaposition the act of positioning close together
  2. apostasy rejection of religious beliefs, political party, or cause
  3. abstruse difficult to understand
  4. apostatize abandon one's beliefs or allegiances
  5. apostatise abandon one's beliefs or allegiances
  6. appositeness appropriateness for the occasion
  7. upstairs on a floor above
  8. abstemious marked by temperance in indulgence
  9. appositive relating to or being in apposition
  10. abstract existing only in the mind
  11. Apus apus common European bird with a shrieking call that nests chiefly about eaves of buildings or on cliffs
  12. oppositeness the relation between opposed entities
  13. epistasis the suppression of a gene by the effect of an unrelated gene
  14. apostrophe a mark used to indicate the omission of one or more letters
  15. obstinate marked by tenacious unwillingness to yield
  16. juxtapose place side by side
  17. apostate not faithful to religion or party or cause
  18. Apios tuberosa a North American vine with fragrant blossoms and edible tubers; important food crop of Native Americans
  19. postpose place after another constituent in the sentence
  20. apposite being of striking appropriateness and pertinence