Unlike descriptors, classifiers do not have primarily a descriptive function. Instead, the function of these adjectives is to make the the whole noun phrase more specific; to restrict the frame of reference. They do this in various ways:

by assigning the head noun to a -
1. class: "secondary education" - This restricts the type of education under consideration; it's not primary or tertiary;
2. part of a cline: "initial conditions" - The conditions at the beginning; not the middle or the end;
3. particular group (already mentioned or generally understood): the "previous year" - Excludes all other years;
4. particular group specifically mentioned in the text: the "following example" - The example which follows in the text;
5. group which obviously excludes another, related one: the "public sector" - As opposed to the private sector;
6. group to which only particular people may be a part: "Chinese students" - only students whose nationality is Chinese;
7. particular topic or area of interest: "chemical analysis" - Not statistical, economic or any other type of analysis.

Unlike descriptors, classifiers are usually non-gradable. In fact, with the possible exception of "public", none of the above examples are gradable.

Classifiers (especially relational and topical classifiers) are very common in academic writing, much more common than descriptors.

Classifiers are usually sub-classified thus:

1. Restrictive/classificational/relational: basic, common, different, empty, entire, external, final, following, full, general, individual, initial, intermediate, internal, main, major, particular, primary, rural, same, secondary, similar, specific, total, urban, various, whole;
2. Affiliative: American, British, Chinese, Danish, French, ....;
3. Topical/General: chemical, commercial, environmental, human, industrial, legal, local, medical, mental, natural, normal, oral, physical, political, public, sexual, social, visual;

Some of these classifiers may also be used as descriptors depending on their use in context.

Examples

• Honey bees and bumblebees are both social adjective (topical classifier) bee species. noun phrase (Zehnder 2020)

In this sentence there is just one adjective: "social". It is an attributive See the glossary definition adjective (preceding the noun) and it is a topical classifier.




• Pictures are created by basic adjective (relational classifier) units noun phrase head called pixels. (Weitzen 2022)

In this sentence there is just one adjective: "basic". It is an attributive See the glossary definition adjective and it is a relational classifier. The head noun is "units" and it is postmodified with an ed-clause.




• Additionally, we’re the only animal that expresses thoughts in full adjective (restrictive classifier) sentences. noun phrase head (Futrell 2022)

In this sentence there is just one adjective: "full". It is an attributive adjective and it is a restrictive classifier.




• Human adjective (topical classifier) eyesight noun phrase head is designed for daylight. (Buscha 2023)

In this sentence there is just one adjective: "Human". It is an attributive adjective and it is a topical classifier.




• Emotional adjective (topical classifier) self-regulation noun phrase head and striving for permanent adjective (relational classifier) internal adjective (relational classifier) equanimity noun phrase head are two very different adjective (relational classifier) things. noun phrase head (Durrant 2023)

In this sentence there are four adjectives: "emotional", "permanent", "internal", and "different". "Emotional" is a topical classifier: the others are relational.

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