The word is echelon and the first parameter is the part of speech, followed by a List containing definitions and an optional third parameter, which can be a List of synonyms.
You can include descriptions, examples, abbreviations, stewardship, synonyms, and related terms.
If two terms are not synonyms, but are related in some other way that is important, you can designate them as related terms.
If your metadata repository includes some different terms that mean the same thing, you can designate such terms as synonyms.
