Any action that you perform regularly as part of your routine can be called a habit. Flossing your teeth would be considered a good habit. Sucking your thumb would be considered a bad habit, especially as an adult.

On New Year's people always vow to break their bad habits, but bad habits die hard. The noun habit can also refer to an established custom — like the habit of breaking bread with your family every holiday. On a completely different note, clothing that is worn for horseback riding, or by a nun or monk, can also be called a habit. All good nuns should be in the habit of washing their habits.

Definitions of habit
  1. noun
    an established custom
    “it was their habit to dine at 7 every evening”
    synonyms: wont
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    type of:
    custom, tradition
    a specific practice of long standing
  2. noun
    the general form or mode of growth (especially of a plant or crystal)
    “a shrub of spreading habit
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    type of:
    development, growing, growth, maturation, ontogenesis, ontogeny
    (biology) the process of an individual organism growing organically; a purely biological unfolding of events involved in an organism changing gradually from a simple to a more complex level
  3. noun
    excessive use of drugs
    synonyms: drug abuse, substance abuse
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    alcohol abuse, alcoholic abuse, alcoholism abuse
    excessive use of alcohol and alcoholic drinks
    type of:
    abuse, misuse
    improper or excessive use
  4. noun
    (psychology) an automatic pattern of behavior in reaction to a specific situation; may be inherited or acquired through frequent repetition
    “owls have nocturnal habits
    “she had a habit twirling the ends of her hair”
    synonyms: use
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    stereotyped behavior
    second nature
    acquired behavior that is practiced so long it seems innate
    the habit of keeping free of superficial imperfections
    type of:
    custom, usage, usance
    accepted or habitual practice
  5. noun
    a distinctive attire worn by a member of a religious order
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    a habit worn by clerics
    monastic habit
    a long loose habit worn by monks in a monastery
    nun's habit
    a long loose habit worn by nuns in a convent
    type of:
    attire, dress, garb
    clothing of a distinctive style or for a particular occasion
  6. noun
    attire that is typically worn by a horseback rider (especially a woman's attire)
    synonyms: riding habit
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    type of:
    attire, dress, garb
    clothing of a distinctive style or for a particular occasion
  7. verb
    put a habit on
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    type of:
    apparel, clothe, dress, enclothe, fit out, garb, garment, habilitate, raiment, tog
    provide with clothes or put clothes on
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