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Russian
большая полуось
Portuguese
eixo maior
Spanish
semieje mayor
Catalan
eix major
Wikidata

Longest interval from a point on an ellipse to its center.

большая полуось
1
In either instrument, the semi-major axis C X is equal to S R, and the semi-minor axis to S P.
Scientific American Supplement, No. 470, January 3, 1885
2
In fact, the square of the period is proportional to (but not equal) to the cube of the semi-major axis.
Wired
1
He fired the opposite thruster, and the eccentricity improved, but semimajor axis got worse.
Anathem