semimajor axis

Etymology
From.

Noun

 * 1)  Half of the major axis of a circle or ellipse.
 * 2)  Half of the distances between the two branches of a hyperbola.
 * 1)  Half of the distances between the two branches of a hyperbola.

Translations

 * Chinese:
 * Mandarin:
 * French:
 * German: Ellipsenhalbachse, Halbachse
 * Japanese: 半長軸
 * Turkish: ana eksen, büyük eksen