classifier

Noun

1. Someone who classifies.
   • He was a model of anal defensiveness: fastidious in his dress and appearance, a collector and putter of things in order, a classifier and labeler. - 1995, Leonard Shengold, Delusions of Everyday Life, page 39:
2. A word or morpheme used in some languages (such as CJKV languages and sign languages), in certain contexts (such as counting), to indicate the semantic class to which something belongs.
3. A machine that separates particles or objects of different size or density.
4. A program or algorithm that classifies.
5. A metaclass used to group other entities having common features.
   • A classifier can have several types of extra information attached to it via a UML mechanism called adornments. - 2005, Dan Pilone, Neil Pitman, UML 2.0 in a Nutshell: A Desktop Quick Reference, page 9:
   • The owner scope of a feature specifies whether the feature appears in each instance of the classifier or whether there is just a single instance of the feature for all instances of the classifier. - 2008, S.S.Jadhav...
   • The figure also shows that instances can be associated with a classifier Behavior, which represents the behavior that active objects start executing when created. - 2017, Katalin Popovici, Pieter J. Mosterman, Real-Time...