By heads or per head; a Latin legal/administrative term meaning 'individually' or 'per capita.'
From Latin capitatim, an ablative/instrumental form from caput (head), meaning 'in the manner of heads' or 'by way of heads.'
This is a technical legal term that survives in 'per capita' (per head), which still appears in statistics and economics. Medieval administrators used capitatim when distributing things individually rather than in groups.
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