seven

Từ điển Oxford Advanced Learner 8th

seven [seven sevens] BrE [ˈsevn] NAmE [ˈsevn] number
7  There are examples of how to use numbers at the entry for five.
more at at sixes and sevens at ↑six
Idiom: ↑seven-year itch

Word Origin:
Old English seofon, of Germanic origin; related to Dutch zeven and German sieben, from an Indo-European root shared by Latin septem and Greek hepta.

• Từ đồng nghĩa / Synonyms:
  seven-spot, 7, VII, sevener, heptad, septet, septenary, vii