a. Of or relating to the Christian Trinity.
b. Believing or professing belief in the Christian Trinity or the doctrine of the Trinity.
2. trinitarian Having three members, parts, or facets.
1. One who believes in the Christian doctrine of the Trinity.
2. A member of a Roman Catholic religious order founded in 1198 and now devoted to teaching, nursing, and pastoral work.
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.