n. pl. sta·bil·i·ties
1. The state or quality of being stable, especially:
a. Resistance to change, deterioration, or displacement.
b. Constancy of character or purpose; steadfastness.
c. Reliability; dependability.
2. The ability of an object, such as a ship or aircraft, to maintain equilibrium or resume its original, upright position after displacement, as by the sea or strong winds.
3. Roman Catholic Church A vow committing a Benedictine monk to one monastery for life.
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.