Condensation polymerisation, also called polycondensation, is the building of a polymer in which the monomers join together with the loss of a small molecule, such as water or methanol, at each new linkage. It matters because it is the route to important materials such as polyesters and polyamides. It contrasts with addition polymerisation, in which monomers add together without loss of any atoms, the whole monomer being incorporated into the chain.

缩合聚合,又称缩聚,是构建聚合物的一种方式,其中单体连接时每形成一个新的连接即脱去一个小分子,如水或甲醇。它之所以重要,是因为它是制备聚酯和聚酰胺等重要材料的途径。它与加成聚合形成对照,后者单体相加时不脱去任何原子,整个单体都被并入链中。