Polymer or oligomer
the molecules of which are capable of entering, through reactive groups, into further polymerization
and thereby contributing more than one structural unit to at least one type of chain of the final polymer.
PAC, 2004, 76, 889
(Definitions of terms relating to reactions of polymers and to functional polymeric materials (IUPAC Recommendations 2003))
on page 897
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook