angle of incidence
1. The angle formed by a ray or wave incident on a surface and a line perpendicular to the surface at the point of incidence.
2. The angle between an aircraft's longitudinal axis and a line bisecting a wing's chord.
(click for a larger image)angle of incidence
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.