able (Adjective) — (usually followed by 'to') having the necessary means, skill, know-how or authority to do something. ex. "able to swim" ex. "she was able to program her computer" ex. "we were at last able to buy a car" ex. "able to get a grant for the project"
able (Adjective) — Having the skills and qualifications to do things well. ex. "able teachers"
able (Adjective) — Having inherent physical or mental ability or capacity. ex. "able to learn" ex. "human beings are able to walk on two feet" ex. "Superman is able to leap tall buildings"
able (Adjective) — Having a strong healthy body. ex. "an able seaman" ex. "every able-bodied young man served in the army"
able (Other) — Able to be, subject to.