his·tor·i·cal (hĭ-stôrĭ-kəl, -stŏr-)
a. Of or relating to history; concerned with past events: a historical account.
b. Based on past events or set in the past: a historical novel.
c. Used in or providing evidence of the past: historical costumes; historical records.
2. Concerned with phenomena as they change through time: a historical dictionary.
3. Important or famous in history. See Usage Note at historic.
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.