From Latin 'annus' (year), from PIE 'to go' — the year is etymologically a going around, the sun's circuit.
Occurring once every year; calculated over or covering a period of one year.
From Late Latin 'annuālis' (yearly), from Latin 'annuus' (yearly, returning each year), from 'annus' (year, a circuit), from PIE *h₂et-no- (going), from *h₂et- (to go). The underlying concept is the year as a 'going around' — the sun's circuit. Cognate with Sanskrit 'atati' (he goes, he walks) and
The Latin word 'annus' (year) literally meant 'a going around' — the sun's annual circuit. This is why 'anniversary' means 'year-turning' (annus + vertere, to turn) and 'perennial' means 'through the years.' The English 'year' is unrelated — it comes from Proto-Germanic '*jērą,' from a different
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