What is another word for "quadruplication"?

Roget's Thesaurus (1911) lists these synonyms for "quadruplication": biquadrate, divide, farthing, four, fourfold, fourth, fourthly, into, multiply, place, quadrable, quadrant, quadrible, quadrifid, quadrifoliate, quadrigeminal, quadripartite, quadripartition, quadrisection, quadrumanous, quadruple, quadruplicate, quart, quarter, quartered, quartering, quartern, rectangular, the.