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Webster 1913 Edition

Adj.

[Cf. OF.

preambulaire

Of or pertaining to a preamble; introductory; contained or provided for in a preamble.

“A preambulary tax.”

[R.]

Burke.

preambulary ‎(comparative more preambulary, superlative most preambulary)

Of or pertaining to a preamble; introductory.
(Can we find and add a quotation of Burke to this entry?)