人にん月げつにんげつFreq.FrequencyTop 100,000Meanings1nounman-month; person-monthA unit of work representing the effort of one person working for one month, used in project management and software engineering.このプロジェクトには100人にん月げつの工こう数すうが必ひつ要ようです。This project requires 100 man-months of effort.