in·​ter·​sys·​tem | \ ˌin-tər-ˈsi-stəm How to pronounce intersystem (audio) \
variants: or inter-system

Definition of intersystem

: occurring between or involving two or more systems intersystem solutions an inter-system link In a decision that largely affirmed the findings of Administrative Law Judge William Cowan, FERC addressed the general question of how fuel costs recovered from intersystem sales should be allocated through the fuel cost adjustment clause (FCAC) when the sales are market-based rate transactions.— Esther Whieldon Triplet excited-states in molecules and polymers are formed via intersystem crossing, which is a radiationless process from a singlet to a triplet state involving a spin flip of one of the electrons.— Catherine De Castro et al.

First Known Use of intersystem

1889, in the meaning defined above

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The first known use of intersystem was in 1889

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