All 4 Uses

hygiene
in
Not Without My Daughter
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He knew the value of hygiene and he appreciated a healthful diet.
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hygiene = practices promoting the prevention of illness and maintenance of health -- such as cleanliness
The other half seemed a bit more westernized, more open to variation, more cultured and friendly, and definitely more hygienic.†
He would realize that his professional future was in America, not in a backward nation that had yet to learn the lessons of basic hygiene and social justice.†
Nasserine kept a cleaner home than Essey, but I soon realized that she was an atrocious cook, neither knowing nor caring much about hygiene, nutrition, or palatabilitY.†

Definitions:

(1) (hygiene)
practices promoting the prevention of illness and maintenance of health -- such as cleanliness or promoting sanitary conditions
(2) (meaning too rare to warrant focus)