homologate

Homologate is a verb with several related meanings across fields. In chemistry, to homologate a compound means to convert it into a homolog by lengthening its carbon chain by one methylene group. This idea underpins homologation reactions, such as the Arndt–Eistert reaction, which converts carboxylic acids into higher homologues while preserving functional groups. Practically, homologation is used to generate systematic series of compounds for synthesis or study of structure–property relationships.

In biology and comparative anatomy, homology refers to similarity due to shared ancestry. The verb “to homologate” is uncommon but may be used to describe the act of establishing that two structures or sequences are homologous.

In regulatory and industrial language, homologation (often spelled homologation) is the formal process by which authorities certify that a product, vehicle, or device meets applicable standards. A manufacturer seeks homologation to market a model in a jurisdiction; the resulting authorization or certificate confirms regulatory compliance, safety, and labeling requirements.

Etymology: from Greek homologia, “agreement, correspondence.”