1. in front at or in the front
  2. invariant unvarying in nature
  3. confront oppose, as in hostility or a competition
  4. affront a deliberately offensive act
  5. infract act in disregard of laws, rules, contracts, or promises
  6. upfront frank and honest
  7. informant a person who supplies facts or knowledge
  8. indifferent marked by a lack of interest
  9. out front leading or ahead in a competition
  10. wavefront (physics) an imaginary surface joining all points in space that are reached at the same instant by a wave propagating through a medium
  11. infrequent not occurring regularly or at short intervals
  12. oceanfront land bordering an ocean
  13. environs the area in which something exists or lives
  14. infringe advance beyond the usual limit
  15. environ extend on all sides of simultaneously; encircle
  16. infarct localized necrosis resulting from obstruction of the blood supply
  17. inferno a very intense and uncontrolled fire
  18. wave front all the points just reached by a wave as it propagates
  19. Inferno the abode of Satan and the forces of evil
  20. invert turn inside out or upside down

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