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Webster 1913 Edition

(-men′tȧ-b’l)

Adj.

[L.

argumentabilis

Admitting of argument.

[R.]

Chalmers.

argumentable ‎(comparative more argumentable, superlative most argumentable)

(archaic) Admitting of argument; arguable.
(Can we find and add a quotation of Chalmers to this entry?)