a. Astronomy The point in an orbit around the planet Earth where the orbiting body is farthest from the planet.
b. The analogous point in an orbit around a celestial body other than Earth. Not in technical use.
2. The farthest or highest point; the apex:"The golden age of American sail, which began with the fast clipper ships in 1848, reached its apogee in the Gold Rush years"(Los Angeles Times).
[Frenchapogée, fromNew Latinapogaeum, fromGreekapogaion, fromneuter ofapogaios, far from the earth : apo-, apo- + gaia, earth.]
(click for a larger image)apogee
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 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.