supplementally

This term is primarily used in formal, technical, or administrative registers. It describes the addition of information or resources to an existing base to ensure completeness or to provide further detail. It carries a neutral, objective tone and is frequently found in academic papers, legal documents, and corporate reports.

Because it is an adverb, it modifies verbs or adjectives to specify the manner of addition. It is distinct from "additionally," which simply indicates another item in a list; "supplementally" implies that the addition serves to enhance or fill a gap in a primary source or structure.