1a settled or regular tendency or practice, especially one that is hard to give up:he has an annoying habit of interrupting megood eating habits [mass noun]:we stayed together out of habit
informal an addictive practice, especially one of taking drugs:a cocaine habit
Psychology an automatic reaction to a specific situation.
[mass noun] general shape or mode of growth, especially of a plant or a mineral:a shrub of spreading habit
2a long, loose garment worn by a member of a religious order:nuns in long brown habits, black veils, and sandals