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The longer of the two lines about which an ellipse is symmetrical; the axis that passes through both focuses of an ellipse.
(Mathematics) the longer or longest axis of an ellipse or ellipsoid
the axis of an ellipse that passes through the two foci.
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|Noun||1.||major axis - the longest axis of an ellipse or ellipsoid; passes through the two foci|
axis - a straight line through a body or figure that satisfies certain conditions
semimajor axis - one-half the major axis of an ellipse; the distance from the center of an ellipse to one end