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The Collaborative International Dictionary of English v.0.48:

Cata \Cat"a\ [Gr. kata`.] The Latin and English form of a Greek preposition, used as a prefix to signify down, downward, under, against, contrary or opposed to, wholly, completely; as in cataclysm, catarrh. It sometimes drops the final vowel, as in catoptric; and is sometimes changed to cath, as in cathartic, catholic. [1913 Webster]