fa·mil·iar·i·ty (fə-mĭl′yărĭ-tē, -mĭl′ē-ăr-)
n. pl. fa·mil·iar·i·ties
a. Acquaintance with or knowledge of something: I have little familiarity with that software program.
b. The quality of being known from past experience: The familiarity of the buildings made us realize that we must be near the hotel.
2. Established friendship or intimacy: cooperation that came easily because of the partners' familiarity.
a. Improper or unduly intimate friendliness; forwardness: found the familiarity of the sales clerk offensive.
b. An act characterized by forwardness.
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.