a. The use of more words than are required to express an idea; redundancy.
b. An instance of pleonasm.
2. A superfluous word or phrase.
[Late Latin pleonasmus, from Greek pleonasmos, from pleonazein, to be excessive, from pleōn, more; see pelə-1 in the Appendix of Indo-European roots.]
ple′o·nastic (-năstĭk) adj.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 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.