the system of stratification into which the different layers of the earth are divided
of school systems, the school grade into which a school curriculum is divided and to which a student progresses after completing the previous year
the spread of learning
the study, called geomorphology
of the relation between oneself and a person who precedes one in schooling or studies, the relationship of senior
the lowest rank in accordance with the ancient laws and ordinances of Japan
the achievements gained in studies