Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
"Senioritis" Definition
noun
A tendency of seniors in high school or college to skip class or otherwise slack off due to a desire to move on, or because they have already been accepted by a college and their further academic performance is no longer as relevant.
Source: Wiktionary
An ebbing of motivation and effort by school as evidenced by tardiness, absences, and lower grades.
Source: Merriam-Webster
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