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Webster 1913 Edition

Adj.

Of or pertaining to a prelude; of the nature of a prelude; introductory.

[R.]

preludial ‎(comparative more preludial, superlative most preludial)

Of or pertaining to a prelude
- 1992, Tim Carter, Music in Late Renaissance & Early Baroque Italy
  A gradual shift from the improvisatory, preludial ricercare to a more formally structured composition is apparent in a keyboard repertory surviving in manuscript at...