Definition of session noun from the Oxford Advanced Learner's Dictionary
session
noun
ˈseʃn ˈseʃn
1[countable]a period of time that is spent doing a particular activitya photo/recording/training, etc. sessionThe course is made up of 12 two-hour sessions.She has a weekly session at the health club on Saturdays.Two soccer fans plunged to their deaths after a heavy drinking session. see also jam session2[countable, uncountable]a formal meeting or series of meetings of a court, a parliament, etc; a period of time when such meetings are helda session of the UN General AssemblyThe court is now in session.The committee met in closed session(= with nobody else present).an emergency session of Congressthe current parliamentary session see also quarter sessions3[countable]a school or university year4[countable]an occasion when people meet to play music, especially Irish music, in a pub/bar
ˈseʃn 
ˈseʃn 
1 [countable] a period of time that is spent doing a particular activitya photo/recording/training, etc. sessionThe course is made up of 12 two-hour sessions.She has a weekly session at the health club on Saturdays.Two soccer fans plunged to their deaths after a heavy drinking session. see also jam session