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countable and uncountable, plural longevities
The quality of being long-lasting, especially of life. quotations examples
This 142-year-old tiny ex-LNWR SB [signal box, at Batley] is an amazing survivor, probably owing its longevity to its location alongside a level crossing. Indeed it started life as a gate box with the delightful name of Lady Ann's Crossing.
2020 July 1, David Allen, “Signalling from Leeds along the S&C”, in Rail, page 74
Duration over time; persistence. quotations examples
A ‘postdating’ is an example of the use of a lexical item at a later date than currently recorded and these are important in establishing the longevity of use of a term and whether or not it has become obsolete.
2018, James Lambert, “Anglo-Indian slang in dictionaries on historical principles”, in World Englishes, volume 37, page 255