an·nu·i·ty (ə-nĭ-tē, ə-ny-)
n. pl. an·nu·i·ties
a. The annual payment of an allowance or income.
b. The right to receive this payment or the obligation to make this payment.
2. A contract or agreement by which one receives fixed payments on an investment for a lifetime or for a specified number of years.
[Middle English annuite, from Anglo-Norman, from Medieval Latin annuitās, from Latin annuus, yearly, from annus, year; see at- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 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.