plural of class act

(computing) A security breach that is the first of its kind, and leads to others of the same class

plural of class break

Of the highest quality.

(software engineering) 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.

A ring (for one's finger) that shows what school one attended and one's year of graduation.

plural of class reunion

Upper-class. / Recognized for its quality.

of high social position / aristocratic

(set theory) Any one of the subsets into which an equivalence relation partitions a set, each of these subsets containing all the elements of the set that are equivalent under the equivalence relation.