a. A meeting of a legislative or judicial body for the purpose of transacting business.
b. A series of such meetings.
c. The term or duration of time that is taken by such a series of meetings.
2. The part of a year or of a day during which a school holds classes.
3. A period of time devoted to a specific activity: a recording session at a music studio; a login session that was disrupted by a power outage.
[Middle English, from Old French, from Latin sessiō, sessiōn-, act of sitting, from sessus, past participle of sedēre, to sit; see sed- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.