A formal or archaic term meaning 'into this matter' or 'into this document,' used in legal contexts to indicate involvement or inclusion.
From 'here' (this) and 'into' (within). An archaic formation common in formal English, particularly in legal documents and formal letters.
When you hear 'all parties hereinto bound,' it's saying everyone is pulled INTO this agreement—'hereinto' makes inclusion feel almost like being drawn into a document's power!
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