Accrued interest Proportion of interest (coupon) earned on an investment between the last coupon payment until the security value date.
All-or-nothing option See binary option
American option An option that can be exercised at any date prior to expiry. (See European option)
Amortising A principal that is decreasing during the contract period, or is repaid in stages.
Amortising bond A bond that repays the principal in stages over the lifetime of the bond, hence the coupons are gradually reduced. (See perpetual bond)
Annual percentage rate (or APR) (See effective rate, nominal rate)
Appreciation Increase in market value of a security; in particular increase in the value of a currency compared to other currencies. (See depreciation)