im·mer·sion (ĭ-mûrzhən, -shən)
a. The act or an instance of immersing.
b. The condition of being immersed.
2. Baptism performed by totally submerging a person in water.
3. Astronomy The obscuring of a celestial body by another or by the shadow of another.
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.