Oxford Advanced American Dictionary

Definition of seven number from the Oxford Advanced Learner's Dictionary

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seven

number
seven pronunciation English ˈsevn seven pronunciation American ˈsevn
 
7
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There are examples of how to use numbers at the entry for five.
Idioms

the seven-year itch

(informal, humorous) the desire for new sexual experience that is thought to be felt after seven years of marriage
more at at sixes and sevens at six