substate

noun
sub·state | \ ˈsəb-ˌstāt \
variants: or sub-state
plural substates or sub-states

Definition of substate 

: 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

First Known Use of substate

1896, in the meaning defined above

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The first known use of substate was in 1896

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