immunoelectrochemiluminescence UK /ˌɪmjuːnəʊɪˌlɛktrəʊˌkɛmɪˌluːməˈnɛsns/US /ˌɪmjuːnoʊɪˌlɛktɹəʊˌkɛmɪˌluːməˈnɛsns/ noun1 •A laboratory analytical technique in which a target substance is detected or quantified by means of an immunoassay that uses electrochemically triggered chemiluminescent reactions to produce a measurable light signal proportional to the amount of the target.