Superaddition represents the act of adding something on top of what's already there. Synonyms for this term include augmentation, supplement, addendum, appendage, extra, complement, and extension. Superfluity, something that is in excess, is also a synonym. Superimposition refers to the act of adding something onto something else, as does superposition. However, superposition often refers to the physical overlapping of two objects. Other synonyms for superaddition include adjuvant, accessory, and accession. Additionally, postscript and sequel can be used to refer to the addition of information or material after the main text. Overall, numerous synonyms capture the various ways in which superaddition can occur.