from The Century Dictionary.

  • noun Half an axis, as of a hyperbola.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Geom.) One half of the axis of an �llipse or other figure.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun mathematics A line segment, joining the centre of a figure to an edge, that forms half of an axis of symmetry


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