These comprise both @A00472@ in which @A00184@ of small molecules are formed reversibly and macromolecules in which the molecules themselves are of @C01172@ size.
Source: PAC, 1972, 31, 577. (Manual of Symbols and Terminology for Physicochemical Quantities and Units, Appendix II: Definitions, Terminology and Symbols in Colloid and Surface Chemistry) on page 607 [Terms] [Paper]