noun
: a statistical unit combining ton-miles and passenger-miles and used by transportation agencies (as railroads, bus lines, airlines) in measuring the volume of passenger and freight traffic
noun
: a statistical unit combining ton-miles and passenger-miles and used by transportation agencies (as railroads, bus lines, airlines) in measuring the volume of passenger and freight traffic
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012