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Webster 1828 Edition

Adj.

[in and refragable, L. refragor; re and the root of frango, to break.]

That cannot be refuted or overthrown; incontestable; undeniable; as an irrefragable argument; irrefragable reason or evidence.

See also: irrefragable

irréfragable m, f ‎(plural irréfragables)