lon·gev·i·ty (lŏn-jĕvĭ-tē, lôn-)
n. pl. lon·gev·i·ties
a. Long life; great duration of life: His longevity vexed his heirs.
b. Length or duration of life or viability: comparing the longevity of men and women; factors that affect the longevity of seeds.
2. Long duration or continuance, as in an occupation: had unusual longevity in the company; her longevity as a star.
[Late Latin longaevitās, from Latin longaevus, ancient : longus, long; see del-1 in the Appendix of Indo-European roots + aevum, age; see aiw- in the Appendix of Indo-European roots.]
lon·gevous (-jēvəs) adj.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.