sekolah lanjutan tingkat atas

Compound of sekolah lanjutan (“high school (US), secondary school (UK)”) +‎ tingkat (“grade”) +‎ atas (“upper”) from either

• Calque from Japanese 高等 (kōtō, “higher”) +‎ 中学校 (chūgakkō, “secondary (middle) school”). The post-war Japanese term is 高等学校 (kōtōgakkō). Doublet of sekolah menengah tinggi.
• Calque from Chinese 高級中學／高级中学 (gāojí zhōngxué, “senior high school”).

sekolah lanjutan tingkat atas

1. (education) senior high school (US), upper secondary school (UK).

   Synonyms: (dated) sekolah menengah tinggi; sekolah menengah atas; (dated) sekolah menengah umum; (dated) sekolah menengah umum atas

The terms for general upper secondary education are sekolah menengah tinggi (1942-1946), sekolah menengah umum atas (1946-1950), sekolah lanjutan tingkat atas (1963-1967), sekolah menengah umum (1994-2004), and sekolah menengah atas (1950-1961, 1968-1993, 2004-now).