Definition of substate in US English:

substate

noun

  • 1A subdivision of a state, nation, country, etc.; a subsidiary state, territory, etc., within a larger political entity, with varying degrees of autonomy depending on the context.

  • 2A state of existence regarded as a subdivision or component of another state; (Physics) a quantum state that is a subdivision of a more broadly defined state.

Origin

Early 19th century; earliest use found in Louisville (Kentucky) Public Advertiser. From sub- + state.

Pronunciation

substate

/ˈsʌbsteɪt/