Centuple is a seldomly used word which means to multiply by one hundred. However, there are several synonyms for this word that can be used in place of centuple. Some of these synonyms include "hundredfold," "multiplying by one hundred," "increasing a hundred times," "one hundred times more," and "a hundredfold increase." These synonyms convey the same meaning as centuple, but are more commonly used and easily understood by most people. So, if you want to express a hundred-fold increase in something, you can use any of these synonyms to convey your message more clearly and effectively.