/dɪˈnɒmɪneɪtə(r) ||; dɪˈnɑməˌnetɚ/noun [C] (mathematics数学) the number below the line in a FRACTION showing how many parts the whole is divided into, for example the 4 in 3/4 分母（如3/4中的4） ☞Look at numerator and common denominator. 参看numerator及common denominator。