最さい確かく数すうMeanings1nounmost probable number; MPNmathematics›A statistical method used in microbiology to estimate the concentration of viable microorganisms in a sample. Domain-specific term.大だい腸ちょう菌きん群ぐんの検けん査さでは、最さい確かく数すう法ほうがよく使つかわれる。The most probable number method is often used in coliform bacteria testing.