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Douglas Harper's Etymology Dictionary
cladism

1966, from clade + -ism. Related: Cladist.

Usage examples of "cladism".

There are indeed virtues in both cladism and traditional evolutionary taxonomy, and I don't much mind how people classify animals so long as they tell me clearly how they are doing it.

This is the only reason I have troubled my readers with the topic of transformed cladism at all.