What does CD-ROM mean? CD-ROM, compact disc read-only memory (noun) a compact disk that is used with a computer (rather than with an audio system); a large amount of digital information can be stored and accessed but it cannot be altered by the user
The average life, also referred to as the âweighted average lifeâ or âweighted average maturityâ or âWAM,â is a reflection of the rapidity with which the principal of an issue is expected to be paid.
Mathematically, life expectancy is the mean number of years of life remaining at a given age, assuming constant mortality rates. It is denoted by, which means the average number of subsequent years of life for someone now aged, according to a particular mortality experience.he term life expectancy may also be used in the context of manufactured objects, although the related term shelf life is used for consumer products and the terms mean time to breakdown (MTTB) and  mean time between failures  (MTBF) are used in engineering.