sub·clas·si·fi·ca·tion
ˌsəb-ˌkla-sə-fə-ˈkā-shən
1
: a primary division of a classification
2
: arrangement into or assignment to subclassifications
sub·classify
¦səb+
: to form or formulate a detailed classification of : divide into subclasses
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Merriam-Webster unabridged



