It comes from the Latin word "habilis," meaning "skillful, apt, handy."
Here are some other words that share the same root:
* Habilitate: to make fit or suitable
* Rehabilitate: to restore to a former state
* Inability: lack of ability
* Disable: to make incapable
* Habitude: customary manner or practice
* Habitable: suitable for living in
* Habituate: to make accustomed to something