1. ad infinitum without or seemingly without limit
  2. definitely without question and beyond doubt
  3. infinite having no limits or boundaries in time or space
  4. affinity a natural attraction or feeling of kinship
  5. infinity time without end
  6. infinitude the quality of being infinite; without bound or limit
  7. infinitive the uninflected form of the verb
  8. addendum textual matter that is added onto a publication
  9. infinitely continuing forever without end
  10. Adiantum cosmopolitan genus of ferns: maidenhair ferns
  11. indefinite vague or not clearly defined or stated
  12. infantile of or relating to babies
  13. atonement the act of making amends for sin or wrongdoing
  14. infantry an army unit consisting of soldiers who fight on foot
  15. indefinitely to an unknown extent
  16. advent arrival that has been awaited
  17. infant a very young child who has not yet begun to walk or talk
  18. indefinity the quality of being vague and poorly defined
  19. definite precise; explicit and clearly defined
  20. ad libitum without advance preparation