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sunna
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noun,
often capitalized
sun·na
\ˈsu̇(n)-(ˌ)nə, ˈsə(n)-\
variants: or less commonly
sunnah
Definition of sunna
: the body of Islamic custom and practice based on Muhammad's words and deeds
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Origin and Etymology of sunna
Arabic sunna
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Britannica.com: Encyclopedia article about sunna
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