configurational base unit

in polymers
https://doi.org/10.1351/goldbook.C01250
A
constitutional repeating unit
in a
regular macromolecule
, a
regular oligomer molecule
,
regular block
or a regular
chain
, the configuration of which is defined at least at one site of
stereoisomerism
in the
main chain (backbone)
.
Source:
PAC, 1996, 68, 2287. (Glossary of basic terms in polymer science (IUPAC Recommendations 1996)) on page 2291 [Terms] [Paper]