ple·na·ry (plēnə-rē, plĕnə-)
1. Complete in all respects; unlimited or full: a diplomat with plenary powers.
2. Fully attended by all qualified members: a plenary session of the council.
[Late Latin plēnārius, from Latin plēnus, full; see pelə-1 in the Appendix of Indo-European roots.]
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.