A macromolecule the structure of which essentially comprises the repetition of more than one type of constitutional unit or a macromolecule the structure of which comprises constitutional units not all connected identically with respect to directional sense.
Source:
PAC, 1996, 68, 2287. 'Glossary of basic terms in polymer science (IUPAC Recommendations 1996)' on page 2289 (https://doi.org/10.1351/pac199668122287)