Easy to use.

Suitable; competent.

Liable to.

Having the necessary powers or the needed resources to accomplish a task.

Free from constraints preventing completion of task; permitted to; not prevented from.

"I’ll see you as soon as I’m able."

Having the physical strength; robust; healthy.

"After the past week of forced marches, only half the men are fully able."

Rich; well-to-do.

"He was born to an able family."

Gifted with skill, intelligence, knowledge, or competence.

"The chairman was also an able sailor."

Legally qualified or competent.

"He is able to practice law in six states."

Capable of performing all the requisite duties; as an able seaman.

To make ready.

To make capable; to enable.

To dress.

To give power to; to reinforce; to confirm.

To vouch for; to guarantee.

The letter "A" in Navy Phonetic Alphabet.