Englishfor English speakers
six
Determiner
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(ordinal sixth) Six is the number that is after five and before seven. In numerals, it is 6.
Most people sleep from six to nine hours a night.
six
Noun
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The number 6.
Three and three is six.
sigma
Noun
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Eighteen letter of Greek.
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Σσ, and in the word last position, writes as ς.