What is an interjection?

An interjection is defined as an independent word that expresses strong feelings or emotions. These words are often used to convey excitement, surprise, joy, or other intense feelings and are usually punctuated with an exclamation mark when used in written form. Examples of interjections include words like "Wow!", "Oh no!", and "Hooray!". They stand apart from other parts of speech because they do not require a grammatical connection to other words in a sentence.

In contrast, the other options refer to different grammatical concepts. Adjectives are words that modify nouns, transitional phrases serve to connect ideas or sentences, and subordinate clauses are dependent parts of sentences that cannot stand alone. Each of these has distinct functions in sentence structure, which sets them apart from the role of interjections in conveying emotional responses.