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Webster 1913 Edition

Adj.

Of or pertaining to a canton or cantons; of the nature of a canton.

Adj.

Pertaining to a canton; divided into cantons.

cantonal ‎(not comparable)

Of, pertaining to, or divided into cantons.
- 1852 Alexander Frederic Foster - General treatise on geography
  The cantonal governments are all republics, more or less democratic.

cantonal m ‎(feminine singular cantonale, masculine plural cantonaux, feminine plural cantonales)

cantonal m, f ‎(plural cantonales)