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senioritis

[seen-yuh-rahy-tis]
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noun
  1. Informal: Facetious. a decline in motivation or academic performance that supposedly afflicts some seniors in high school, especially in their last term.
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Origin of senioritis

First recorded in 1955–60; senior + -itis
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018