1. (used with a sing. verb) The scientific study of sound, especially of its generation, transmission, and reception.
2. (used with a pl. verb) The total effect of sound, especially as produced in an enclosed space: "Such annoyances are frequently caused by flaws in the acoustics rather than the performers" (Mel Gussow).
(click for a larger image)acoustics
Sound waves from a stage are deflected by sound panels and distributed throughout an auditorium.
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.