hierarchical data structure hierarchical classification system • hierarchical menu · · · Info · Definitions · Synonyms · Characters · · hierarchical data structure · · Text Common · · Latin · · Scripts 27 · · Length 8 · · Syllables Definitions · · · (noun) a structure of data having several levels arranged in a treelike structure. Synonyms: hierarchical structure, hierarchical data structure. · · Noun Definition 1 Synonyms · · · hierarchical structure · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 d latin small letter d U+0064 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 l latin small letter l U+006C r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075