I think that you are probably mistaking the word landgfill for the word 'landfill' and a landfill is a low area of land that is built up from deposits of solid refuse in layers covered by soil. Landfill is the name given to garbage dumps, rubbish tips etc.Typically the local authority finds what they hope is a suitable site, perhaps an old quarry, and then all the garbage collected from residents is dumped there.andfill is the name given to garbage dumps, rubbish tips etc. Typically the local authority finds what they hope is a suitable site, perhaps an old quarry, and then all the garbage collected from residents is dumped there.
The definition of longevity is the amount of time your life or your term of service lasts. An example of longevity is the amount of time you work in a given career. longevity. length of time spent in service, employment, etc.
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.oreover, because life expectancy is an average, a particular person may well die many years before or many years after their expected survival. The term  maximum life span  has a quite different meaning and is more related to longevity.