- The pin or spindle on which a wheel revolves, or which revolves with a wheel.
- A transverse bar or shaft connecting the opposite wheels of a car or carriage; an axletree.
- An axis; as, the sun's axle ."Had from her axle torn The steadfast earth." [Milton.]
Note: ☞ Railway axles are called leading and trailing from their position in the front or in the rear of a car or truck respectively.
Etymology: OE. axel exel, shoulder, AS. eaxl; akin to AS. eax axle, Sw. & Dan. axel shoulder, axle, G. achse axle, achsel shoulder, L. axis axle, Gr. 'a`xwn, Skr. aksha, L. axilla shoulder joint: cf. F. essieu, axle, OF. aissel, fr. dim. of L. axis. √205. Cf. 2d Axis