[life span] n (1918) 1: the duration of existence of an individual
2: the average length of life of a kind of organism or of a material object esp. in a particular environment or under specified circumstances
[life span] n (1918) 1: the duration of existence of an individual
2: the average length of life of a kind of organism or of a material object esp. in a particular environment or under specified circumstances
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012