Definition of senioritis in English:

senioritis

Syllabification: sen·ior·i·tis
Pronunciation: /ˌsēnyəˈrītis/

Entry from US English dictionary

noun

humorous
A supposed affliction of students in their final year of high school or college, characterized by a decline in motivation or performance: I try not to let my grades suffer from my senioritis

Origin

early 20th century: from senior + -itis.

Definition of senioritis in:

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Word of the day demoralize
Pronunciation: dɪˈmɒrəlʌɪz
verb
cause (someone) to lose confidence or hope