substate
noun
sub·state
ˈsəb-ˌstāt
variants
or sub-state
plural substates or sub-states
: a state (such as a physical or atomic state) that is a variant or division of another more broadly defined state
… each quantum state of a given spin angular momentum is split into a number of substates …—Arthur L. Robinson
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Merriam-Webster unabridged
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