Acribbitz [ack-krib-itz] verb, noun -
  1. verb - to increase in quantity, size, or volume. {thanks austin smusz}
  2. noun - a confrontational or mean spirited comment.
Alice B. Tolkien [al-is bee tohl-keen] noun -
  1. a lesbian who writes fantasy novels.
  2. elven lembas prepared with cannabis sativa. {thanks crazymonk}
Alphabetilately [al-fuh-bet-i-lat-ee-lee] noun -
  1. the alphabet of philately.
  2. an exhibit at the National Postal Museum. {source}
Alphabetocracy [al-fuh-bet-ok-ruh-see] [] noun -
  1. a form of government led by those whose names occur first alphabetically.
Antepenantepenultimate [an-tee-pen-an-tee-pi-nuhl-tuh-mit] [] noun -
  1. fifth to last. {thanks jeffrey}
Argumentum ad Hitlerum [ahr-gyuh-men-tuhm ad hit-ler-uhm] [] adjective -
  1. a response to an argument in which a position or factual claim is rebutted by comparing its progenitor to Hitler, or the progenitor’s reasoning to that of the Nazis; the process of proving or disproving the initial claim is thereby subverted. {source}