Did you just recently hear about appositives and now desperately want to know what they are and how they function? You came to the right page. Appositive is a relatively uncommon grammar term which many of us are unaware about. An appositive is a grammar phenomenon that serves its purpose in proper sentence formation of English language and we all must be aware of their definition and usage.
In the above example, Olivia is the appositive which is in apposition to my boss. Notice that Olivia is also a noun and as it is placed very close to another noun my boss, it automatically becomes an appositive. These types of appositives are referred to as noun appositives.
Likewise, appositives can also be in the form of noun phrases. Typically, an appositive is referred to as a noun phrase appositive when it describes in detail the noun placed near it i.e. in a phrase not a word.
Now consider the above example. It uses the noun flower and a noun phrase a wild chrysanthemum with a hue of orange. The noun phrase i.e. a wild chrysanthemum with a hue of orange is the appositive in this case and is called a noun phrase appositive.
Till now, you must have gained some understanding of appositives and their usage. One thing that should be kept in mind while using appositives in a sentence is to make sure you punctuate the sentence very carefully. Appositive are accompanied by commas depending on their position in a sentence.