noun
first-class honors; top honors
Used in academic contexts, especially for UK-style degree classifications. Refers to the highest level of honors.
彼は大学を最優秀成績で卒業した。
He graduated from university with first-class honors.
Compound of 最優秀 (saiyūshū, 'most excellent') and 成績 (seiseki, 'grades' or 'results').