To count or number something; to enumerate or calculate a total amount.
From Latin 'ad-' (to) + 'numerus' (number), coined in the 17th century to mean 'to add up' or 'to count together.' The prefix 'an-' is an older form of 'ad-' used before certain letters.
This word is virtually extinct in modern English, replaced by 'enumerate,' but it shows how Latin prefixes were used creatively in Renaissance scholarship to describe mathematical operations—Renaissance scholars loved making new Latin verbs for precision.
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