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

Keep scrolling for more

Learn More about intersystem

Time Traveler for intersystem

Time Traveler

The first known use of intersystem was in 1889

See more words from the same year

Statistics for intersystem

Cite this Entry

“Intersystem.” Dictionary, Merriam-Webster, Accessed 15 Aug. 2020.

Comments on intersystem

What made you want to look up intersystem? Please tell us where you read or heard it (including the quote, if possible).


Test Your Vocabulary

Name That Thing: Animal Edition

  • alt 5a023732e6f75
  • Name that animal:
Spell It

Can you spell these 10 commonly misspelled words?

Add Diction

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!