An "adjunct" refers to something that is added to another thing but is not an essential part of it. In various contexts, it can describe a person, object, or concept that complements or enhances the main subject. For example, in education, an adjunct professor is a part-time instructor who teaches courses at a college or university but is not a full-time faculty member. In grammar, an adjunct is a word or phrase that provides additional information in a sentence but can be removed without changing the sentence's core meaning. This can include adverbs or prepositional phrases that add detail, such as in the sentence, "She sings beautifully," where "beautifully" is the adjunct.