1. The act of reflecting or the state of being reflected.
2. Something, such as light, radiant heat, sound, or an image, that is reflected.
a. Serious thinking or careful consideration: engaged in reflection on the problem.
b. A thought or an opinion resulting from such thinking or consideration: wrote down her reflections.
4. An indirect expression of censure or discredit: a reflection on his integrity.
5. A manifestation or result: Her achievements are a reflection of her courage.
a. The folding of a membrane from the wall of a cavity over an organ and back to the wall.
b. The folds so made.
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.