configurational repeating unit

in polymers
https://doi.org/10.1351/goldbook.C01253
The smallest set of successive @[email protected] that prescribes configurational repetition at one or more sites of @[email protected] in the main chain of a @[email protected], a @[email protected], a @[email protected] or a regular @[email protected]
Source:
PAC, 1996, 68, 2287. (Glossary of basic terms in polymer science (IUPAC Recommendations 1996)) on page 2291 [Terms] [Paper]