i·de·ol·o·gy (ī′dē-ŏlə-jē, ĭd′ē-)
n. pl. i·de·ol·o·gies
A set of doctrines or beliefs that are shared by the members of a social group or that form the basis of a political, economic, or other system.
[French idéologie : idéo-, ideo- + -logie, -logy.]
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.