Happening once every year or calculated on a yearly basis.
From Latin 'annualis' meaning yearly, derived from 'annus' (year). The suffix '-ly' was added to form the adverb in Middle English, following the pattern of Latin 'annualiter'.
The concept of annual cycles is so fundamental to human civilization that almost every culture has developed sophisticated calendar systems to track yearly patterns. The word 'annual' shares its root with 'anniversary' and 'annuity', showing how deeply embedded yearly thinking is in our language.
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