‘乙等’ (yǐ děng) literally combines ‘乙’—the second character in the traditional Chinese Heavenly Stems (jiǎ, yǐ, bǐng, dīng…), used historically for sequencing—and ‘等’, meaning ‘class’, ‘grade’, or ‘category’. Together, it denotes ‘Grade B’ or ‘second-class’, functioning as a formal ranking label. It is commonly used in academic, professional, or official evaluation contexts—such as exam results, product quality classifications, or civil service performance reviews—to indicate the second-highest tier, just below ‘甲等’ (jiǎ děng, Grade A).

Unlike casual terms like ‘B级’ (B jí), ‘乙等’ carries a slightly more formal, institutional, or bureaucratic tone, often appearing in written reports, certificates, or standardized assessments. It reflects hierarchical categorization rooted in classical Chinese numeration systems, making it less common in everyday speech but still widely understood in educational and administrative settings.