Connected closely with someone through shared experiences or feelings; or stuck together with an adhesive; or legally obligated to do something.
From the noun 'bond' which comes from Old Norse 'banda' meaning to bind. The word has been used since the 1400s for both emotional connections and physical/legal ties.
Parent-child bonding in the first hours after birth releases oxytocin in both the baby and parent's brains, chemically cementing their attachment—nature literally uses the same word we do, because emotional bonding creates real neurological changes.
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