1. Widespread; general.
2. Medicine Epidemic over a wide geographic area and affecting a large proportion of the population: pandemic influenza.
A pandemic disease.
[From Late Latin pandēmus, from Greek pandēmos, of all the people : pan-, pan- + dēmos, people; see dā- in the Appendix of Indo-European roots.]
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.