If you are able to do something, you have skills or qualities which make it possible for you to do it. The older child should be able to prepare a simple meal The company say they're able to keep pricing competitive They seemed able to work together very efficiently. = can
Legally qualified; possessed of legal competence; as, able to inherit or devise property
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
If you are able to do something, you have enough freedom, power, time, or money to do it. You'll be able to read in peace It would be nice to be able to afford to retire earlier. = can
having a strong healthy body; "an able seaman"; "every able-bodied young man served in the army
have the skills and qualifications to do things well; "able teachers"; "a capable administrator"; "children as young as 14 can be extremely capable and dependable"
An adjective suffix now usually in a passive sense; able to be; fit to be; expressing capacity or worthiness in a passive sense; as, movable, able to be moved; amendable, able to be amended; blamable, fit to be blamed; salable