(software engineering) class diagram - A type of static structure diagram that describes the structure of a system by showing the system's classes, their attributes, and the relationships between the classes.

(education) class (group of students in a regularly scheduled meeting with a teacher) / class of things (typically products) sharing certain features / (programming, object-oriented programming) class

first class (a status, section, etc. of premier rank)

business class

(aviation) economy class

(zoology) clasper

エコノミークラス症候群: economy class syndrome, deep vein thrombosis

(pathology) economy class syndrome, deep vein thrombosis