life span

2 ENTRIES FOUND:

life span

noun

: the amount of time that a person or animal actually lives

Full Definition of LIFE SPAN

1
:  the average length of life of a kind of organism or of a material object especially in a particular environment or under specified circumstances
2
:  the duration of existence of an individual

Examples of LIFE SPAN

  1. the average life span of house cats
  2. increase the human life span

First Known Use of LIFE SPAN

1898

life span

noun \ˈlīf-ˌspan\   (Medical Dictionary)

Medical Definition of LIFE SPAN

1
: the duration of existence of an individual
2
: the average length of life of a kind of organism or of a material object especially in a particular environment or under specified circumstances

life span

noun    (Concise Encyclopedia)

Time between birth and death. It ranges from a mayfly's day to certain trees' thousands of years. Its limit appears to depend on heredity, but such factors as (in humans) disease, natural disasters, war, diet, and habits such as smoking reduce it. Maximum life span is theoretical; more meaningful is average life span, which life-insurance companies and actuaries analyze and tabulate. Long-lived progenitors tend to beget long-lived descendants. A very-low-calorie diet appears to prolong life. Reduced infant mortality and improved sanitation and nutrition account for much of the increase since c. 1800—from about 35 to over 70 years in most industrialized countries. The oldest well-documented age reached by a human is 122 years.

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