adjective
Definition: Relating to a type of word that is attached to the beginning of another word and forms a single unit with it, often affecting pronunciation or meaning.
Example: In the phrase 'I'm', the 'I' is a proclitic that combines with 'am'.
noun
Definition: A type of word that is attached to the start of another word and cannot stand alone by itself.
Example: In the phrase 'I'm going', 'I' is a proclitic that attaches to 'am'.