What is "proclitic"

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.

1846, from Medieval Latin procliticus, formed on analogy of encliticus from Greek proklinein "to lean forward," from pro- "forward" (see pro-) + klinein "to lean" (see lean (v.)).

n. (context linguistics English) A clitic which phonetically joins with the following word. In English, the dialectal form t' is an example. In Arabic, conjunctions and prepositions that have only one letter, such as (term lang=ar و tr=wa-), always attach as a prefix to the following word.