noun

an acquired behavior pattern regularly followed until it has become almost involuntary:the habit of looking both ways before crossing the street.

customary practice or use:Daily bathing is an American habit.

a particular practice, custom, or usage:the habit of shaking hands.

a dominant or regular disposition or tendency; prevailing character or quality:She has a habit of looking at the bright side of things.

addiction, especially to narcotics (often preceded by the).