Related: bill, note, stock
A bond fastens things together.
Bonds may be social agreements such as constitutions, laws, ownership titles, fealty, treaties, pacts, etc. which bind humans over time, and are often denoted by signing a paper or digital contract to give them permanence.
A bond is a loan in the form of a security.
The 'borrower' is the 'issuer'
The 'lender' is the 'holder'
The 'interest' is the 'coupon'