Definition of "sessional" [ses•sion•al]

• Pertaining to a period, often an academic term or a sitting of a legislative body. (adjective)
• An instructor hired by a college or universities on a temporary basis. (noun)

Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License

• "A few are constituted for an entire year and are known as sessional committees."
• "I have worked as a "sessional" Assistant Professor for over a decade for two separate universities."
• "Employing sessional lecturers, who are represented by a union, is subject to seniority rules."