- the axis of an ellipse that passes through the two foci.
Origin of major axis
First recorded in 1850–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for major axis
Another groove, J, is made along the longitudinal center of the piece B, to receive the spine of the major-axis swivel head.The Boy Mechanic, Book 2
- the longer or longest axis of an ellipse or ellipsoid
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012