Synonyms for Fourfold (same or very similar meaning)
WordNet sense 1 (having four units or components):
quadruple, quadruplicate, quadruplexWordNet sense 2 (having or involving or consisting of more than one part or entity or individual):
multipleWordNet sense 3 (by a factor of four):
four timesFrom the ODE community, based on WordNetadd/edit