Most of these terms were compiled by Will Strain and Angela Ba'Tal Libal at:
http://www.geocities.com/soho/3698/rom.htm
Antiziganism - (or Anti-Romanyism) is hostility, prejudice or racism directed at the Roma people, commonly (but pejoratively) called Gypsies.
Ashkali - (Aschkali, Hashkali, Aškalije (Ашкалије), Haškalije (Хашкалије)) are an Albanian language speaking ethnic minority of Kosovo and Albania. Their origin is disputed. Ashkali are often regarded as Albanized Roma, but some think they are descendants of Turks or Egyptians. Ashkali have similar culture to both Roma and Albanians. There is a theory that Ashkali are descendants of Roma who are said to have come to the Balkans from Palestine (their name deriving from Ashkelon, a city in Israel).
Assimilation - when one ethnic group absorbs another, so that the cultural traits of the assimilated group become indistinguishable.