To this; to this matter or purpose; attached or relating to this document or subject.
Compound of 'here' (Old English 'hēr') and 'unto' (Old English 'unto,' meaning 'to'). A formal term used in legal and religious documents.
'Hereunto' appears constantly in old legal documents, especially in phrases like 'I hereunto set my hand'—meaning 'I hereby sign this'—showing how archaic words persist in legal language because they're associated with formality and binding agreements.
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