bond
n.
early 13c., "anything that binds," phonetic variant of band, n.1. For vowel change, see long, adj.; also influenced by Old English bonda "householder," literally "dweller" (see bondage). Legalistic sense first recorded 1590s.
v.
1670s (transitive), from bond, n.. Intransitive sense from 1836. Originally of things; of persons by 1969. Related: Bonded; bonding. Male bonding attested by 1969.