intr.v. ex·pa·ti·at·ed, ex·pa·ti·at·ing, ex·pa·ti·ates
1. To speak or write at length: expatiated on the subject until everyone was bored.
2. To wander freely.
[Latin expatiārī, expatiāt- : ex-, ex- + spatiārī, to spread (from spatium, space).]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. 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.