Interest earned but not received (realized). For example, bonds usually pay interest every six months in form of coupon, therefore interest accrues between one interest payment and the next. The buyer of a bond pays its market value plus the interest earned up to the settlement date of the coupon.
A financial contract between an insurance company and the policy holder (purchaser) that provides for a series of payments at regular intervals to be received for a number of years or over a lifetime. Earnings of annuities grow tax-free until payouts begin, which is usually around 65. Annuities are hybrids of insurance and investments. Examples include variable, fixed, deferred, and market value adjusted.
A pension scheme in which the beneficiary makes a defined contribution (usually a percentage of pensionable salary) and the main sponsor pays the remainder of the (unknown) cost of providing the benefits. Historically most UK defined benefit pension schemes were established to be of this type. (Source: Association of Corporate Treasurers)