Merriam-Webster Collegiate Dictionary - session

 I. noun  Etymology: Middle English, from Anglo-French, from Latin ~-, sessio, literally, act of sitting, from sedere to sit — more at sit  Date: 14th century  1. a meeting or series of meetings of a body (as a court or legislature) for the transaction of business morning ~  2. plural  a.  (1) a sitting of English justices of peace in execution of the powers conferred by their commissions  (2) an English court holding such ~s  b. any of various courts similar to the English ~s  3. the period between the first meeting of a legislative or judicial body and the prorogation or final adjournment  4. the ruling body of a Presbyterian congregation consisting of the elders in active service  5. the period during the year or day in which a school conducts classes  6. a meeting or period devoted to a particular activity a recording ~  • ~al adjective  II. adjective  Date: 1958 employed to perform at recording ~s a ~ drummer