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1921 E. Sapir Lang. v. 107 Pure Relational Concepts (purely abstract): normally expressed by affixing non-radical elements to radical elements..or by their inner modification, by independent words, or by position; serve to relate the concrete elements of the proposition to each other, thus giving it definite syntactic form.

1921 E. Sapir Lang. vi. 145 Languages that keep the syntactic relations pure and that do not possess the power to modify the significance of their radical elements by means of affixes or internal changes. We may call these Pure-relational non~deriving languages or, more tersely, Simple Pure-relational languages. These are the languages that cut most to the bone of linguistic expression.

1944 R. A. Hall Hungarian Gram. (Language Monograph No. 21) 22 There are three fundamental types of suffixes which are added to substantives: derivational (the plural suffix), concrete-relational (the personal possessive suffixes, expressing ownership of the object denoted by the noun, on the part of the person indicated by the suffix), and pure-relational (twenty suffixes, including the accusative, whose addition gives the substantive adverbial function).

1963 N. N. Poppe Tatar Man. ii. 34 Pure-relational suffixes are added to the concrete-relational (possessive) suffixes... The pure-relational suffixes serve to denote the relations between an object and other objects or between an object and an action. The system of pure-relational forms is what is commonly called ‘declension’.