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WORDNET DICTIONARY

Adjective pre-existent has 1 sense

• pre-existent(s = adj.all) pre-existing, preexistent, preexisting - existing previously or before something; "variations on pre-existent musical themes"
Derived form verb preexist₁

ROGET THESAURUS

pre-existent

Priority

N priority, antecedence, anteriority, precedence, pre-existence, precession, precursor, the past, premises, prior, previous, preceding, precedent, anterior, antecedent, pre- existing, pre-existent, former, foregoing, aforementioned, before- mentioned, abovementioned, aforesaid, said, introductory, before, prior to, earlier, previously, afore, aforehand, beforehand, ere, theretofore, erewhile, ere then, ere now, before then, before now, erewhile, already, yet, beforehand, on the eve of, prior tempore prior jure.

For further exploring for "pre-existent" in Webster Dictionary Online