GNU Collaborative International Dictionary of English

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1.       
   ‖Epi- . [Gr. ἐπί on, upon, to; akin to Skr. api besides, and prob. to L. ob to, before, on account of, and perh. to E. of, off.] A prefix, meaning upon, beside, among, on the outside, above, over. It becomes ep-before a vowel, as in epoch, and eph-before a Greek aspirate, as in ephemeral.
   1913 Webster