n. pl. pre·sid·i·a (-ē-ə) or pre·sid·i·ums
1. Any of various permanent executive committees in Communist countries having power to act for a larger governing body.
2. Presidium The executive committee of the Supreme Soviet headed by the president in the former Soviet Union.
[Russian prezidium, from Latin praesidium, garrison; see PRESIDIO.]
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.