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Webster 1913 Edition

Adj.

[Cf. F.

rétrogressif

Tending to retrograde; going or moving backward; declining from a better to a worse state.

(Biol.)

Passing from a higher to a lower condition; declining from a more perfect state of organization; regressive.

Adj.

Going or moving backward; declining from a more perfect to a less perfect state.

Geography is at times retrogressive.