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English definition of “session”

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session

noun uk   /ˈseʃ.ən/ us  

session noun (FORMAL MEETING)

[C or U] a formal meeting or series of meetings of an organization such as a parliament or a law court: The parliamentary session is due to end on 27 May. The UN Security Council met in emergency session to discuss the crisis.
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session noun (ACTIVITY)

B1 [C] a period of time or meeting arranged for a particular activity: The 21-year-old runner twisted his ankle in a training session last Friday. As the European heads of state gathered, the press were allowed in for a photo session. informal Rob and I had a heavy session last night (= we drank a lot of alcohol).
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session noun (COLLEGE PERIOD)

[C or U] US or Scottish English at a college, any of the periods of time that a teaching year or day is divided into, or the teaching year itself: The session begins on 1 October . Access is restricted when school is in session.
(Definition of session from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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