What does able mean?
The definition of able
A”ble, a. [Comp. Abler; superl. Ablest.]
Etym: [OF. habile, L. habilis that may be easily held or managed, apt, skillful, fr. habere to have, hold. Cf. Habile and see Habit.]

1 Fit; adapted; suitable. [Obs.] A many man, to ben an abbot able. Chaucer.
2 Having sufficient power, strength, force, skill, means, or resources of any kind to accomplish the object; possessed of qualifications rendering competent for some end; competent; qualified; capable; as, an able workman, soldier, seaman, a man able to work; a mind able to reason; a person able to be generous; able to endure pain; able to play on a piano.
3 Specially: Having intellectual qualifications, or strong mental powers; showing ability or skill; talented; clever; powerful; as, the ablest man in the senate; an able speech. No man wrote abler state papers. Macaulay.
4 (Law)
Legally qualified; possessed of legal competence; as, able to inherit or devise property.

Note: Able for, is Scotticism. “Hardly able for such a march.” Robertson.
Synonyms
— Competent; qualified; fitted; efficient; effective; capable; skillful; clever; vigorous; powerful.

A”ble, v. t.
Etym: [See Able, a.] [Obs.]

1 To make able; to enable; to strengthen. Chaucer.
2 To vouch for. “I ‘ll able them.” Shak.