Intuitive, flexible, and evolving terminology plays a significant role in capitalizing on recommended knowledge representation models for material engineering applications. In this article we present a proposed rules-based approach with initial examples from a growing corpus of materials terms in the NIST Materials Data Repository (https://materialsdata.nist.gov
). Our method aims to establish a common, consistent, evolving set of rules for creating or extending terminology as needed to describe materials data. The rules are intended to be simple and generalizable for users to understand and extend; for groups to apply to their own repositories; and for machines to process as well as act upon.