Plural of 'annus' (year in Latin), or possibly a shortened form of 'anniversary'. Also appears in compound words relating to years or annual events.
From Latin 'annus' meaning year, with 'anni' as its plural form. Common in Latin phrases like 'anni domini' (years of our Lord) and academic contexts discussing multiple years of study or experience.
While rarely used alone in English, 'anni' appears in many familiar phrases - 'alumni' (former students), 'anniversary' (turning of the year), and 'annual' all share this root. The Romans were obsessed with time-keeping and year-counting, giving us this rich vocabulary for marking temporal cycles.
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