from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Half of the major axis of a circle or ellipse.
- n. Half of the distances between the two branches of a hyperbola.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. one-half the major axis of an ellipse; the distance from the center of an ellipse to one end
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