Cleanliness is a habit of staying neat and tidy, or sterile. Cleanliness in your bedroom is nice, but cleanliness in a hospital operating room is critical.

If your friend remarks on the cleanliness of your locker, it's probably because of your thoughtful, color-coordinated organizational system. And if that same friend questions the cleanliness of your socks, it's probably because your feet smell terrible. Cleric John Wesley, one of the founders of Methodism, is famous for the line, "Cleanliness is next to Godliness," implying that how clean or dirty you are is a reflection of your moral character.

Definitions of cleanliness
  1. noun
    the habit of keeping free of superficial imperfections
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    type of:
    habit, use
    (psychology) an automatic pattern of behavior in reaction to a specific situation; may be inherited or acquired through frequent repetition
  2. noun
    diligence in keeping clean
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    lack of cleanly habits
    the trait of being meticulous about matters of taste or style
    neatness, tidiness
    the trait of being neat and orderly
    the trait of being excessively fastidious and easily shocked
    type of:
    a distinguishing feature of your personal nature
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