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Webster 1913 Edition

Adj.

[

Equi-

+ L.

numerans

, p. pr. of

numerare

to number.]

Equal as to number.

[Obs.]

Arbuthnot.

Adj.

[L. oequus, equal, and numerus, number.]

Having or consisting of the same number. [Little used.]

equinumerant ‎(not comparable)

(rare, chiefly obsolete) Equal in number.
(Can we find and add a quotation of Arbuthnot to this entry?)
- 1967, The Canadian Patent Office Record (volume 95, issues 1-4, page 94)
  In a key and lock system, a key member carrying a signature comprising a plurality of index elements, two equinumerant groups of said index elements being interrelated by a predetermined conversion code, and a lock device […]