n. pl. fe·lic·i·ties
a. Great happiness; bliss.
b. An instance of great happiness.
2. A cause or source of happiness.
a. An appropriate and pleasing manner or style: felicity of expression.
b. An instance of appropriate and pleasing manner or style.
4. Archaic Good fortune.
[Middle English felicite, from Old French felicite, from Latin fēlīcitās, from fēlīx, fēlīc-, fortunate; see dhē(i)- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 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.