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mid·ses·sion / ˈmidˌseshən; ˌmidˈsesh-/ • n. the middle of a session, particularly: ∎  a period of active trading on a securities exchange: the Mexico peso regained some lost ground to the U.S. dollar toward midsession Friday. ∎  a period of instruction: both students and instructors can be called away in midsession to cope with emergencies. ∎  a legislative session.