Bond

alliance

(binding agreement, covenant)

appareil

(specific pattern of bricklaying)

entrave

(that which binds, a band)

liaison

(chemistry: link or force between neighbouring atoms in a molecule)

lien

(that which binds, a band)

lien

(emotional link, connection or union)

obligation

(finance: documentary obligation to pay a sum or to perform a contract)

appareiller

(construction: to lay bricks in a specific pattern)

lier

(to connect, secure or tie with a bond; to bind)