Definition: Approximants are words or phrases that have no direct meaning but can be used in a particular way, often providing additional meaning within an expression or sentence. They're often used figuratively to describe something specific rather than literal meaning. Examples include the word "he" for the subject of a noun phrase or the word "it" as a placeholder for another subject or verb. These words are usually not considered actual words in English and are only used figuratively to enhance the expression, like a rhetorical device or metaphorical interpretation.