From the numbersju(“seven”).

sjua c

1. seven; the digit "7"
2. seventh-grader; pupil in the seventh year of school
3. a class of seventh-graders
4. (uncountable, mainly used in the definite) the seventh year in school

   De barnen går isjuan.

   Those children are inseventh grade.

5. a person who finishes a competition in seventh place

• slå en sjua

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