preludial

from The Collaborative International Dictionary of English v.0.48

Preludial \Pre*lud"i*al\, a.
   Of or pertaining to a prelude; of the nature of a prelude;
   introductory. [R.]
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

28 Moby Thesaurus words for "preludial":
      antecedent, anterior, chief, exordial, first, foremost, headmost,
      inaugural, inductive, initiatory, introductory, leading, precedent,
      preceding, precessional, precursory, prefatory, prefixed, prelim,
      preliminary, prelusive, preparative, preparatory, prepositive,
      prevenient, prior, proemial, propaedeutic