'authorhood' originates from Modern English, specifically the combination of 'author' (ultimately from Latin 'auctor') and the suffix '-hood' (from Old English 'hād'), where 'author' meant 'originator' and 'hād' meant 'state or condition'.

'authorhood' developed by combining Middle English 'author' (borrowed via Old French from Latin 'auctor') with the Old English-derived suffix '-hood' (earlier forms '-hād'/'-hode'), eventually yielding the modern English formation 'authorhood'.

Initially the elements referred to an 'originator' and the 'state/condition' of something; over time the combined form has come to mean specifically the 'state of being an author' (i.e., authorship).