Composed of 女子 (female, girl) + 中学生 (junior high school student). A straightforward compound that specifies both the sex and the school level of the student at once.
Japanese compulsory education runs through the end of junior high school, so a 女子中学生 is normally aged 12–15 (first-year 13, second-year 14, third-year 15, by academic-year reckoning).
COMMON COLLOCATIONS:
- 女子中学生向け: aimed at / for junior high school girls
- 女子中学生対象の調査: a survey targeting junior high school girls
- 女子中学生の制服: the uniform of junior high school girls
- 女子中学生約百人: about one hundred junior high school girls
RELATED SCHOOL-LEVEL TERMS:
- 男子中学生: male junior high school student
- 女子小学生: female elementary school student
- 女子高生: female high school student (very common informal form)
- 女子高校生: female high school student (full formal form)
- 女子大生: female university student
REGISTER:
Neutral and commonly used in news articles, school notices, advertising, and academic writing. In casual conversation, speakers often drop 女子 and just say 中学生 if the sex is clear from context, or use more casual phrasing like ちゅうがく一年生の女の子.
NOTE ON USAGE:
Like its counterpart 女子高生, 女子中学生 appears frequently in crime-news headlines and in statistical reports that break figures down by sex and school level. It is a neutral descriptor, not a loaded term.