bond
n.
1. Something, such as a fetter, cord, or band, that binds, ties, or fastens things together.
2. Confinement in prison; captivity. Often used in the plural.
3. A uniting force or tie; a link: the familial bond.
4. A binding agreement; a covenant.
5. A duty, promise, or other obligation by which one is bound.
6.a. A substance or agent that causes two or more objects or parts to cohere.
b. The union or cohesion brought about by such a substance or agent.
7. A chemical bond.
8. A systematically overlapping or alternating arrangement of bricks or stones in a wall, designed to increase strength and stability.
