Source : Webster's Revised Unabridged Dictionary (1913)

Proclitic \Pro*clit"ic\, a. [Gr. ? to lean forward; ? forward +
   ? to lean or incline. Cf. {Enclitic}.] (Gr. Gram.)
   Leaning forward; -- said of certain monosyllabic words which
   are so closely attached to the following word as not to have
   a separate accent.