Meaning of ppm in English. ppm. noun [ U ] uk / ˌpiː.piːˈem / us / ˌpiː.piːˈem /. Add to word list Add to word list. abbreviation for parts per million (= a unit for measuring the amount of a substance that is mixed with a liquid or another substance) People Power Movement (Philippines) Personnel & Property Manager Parent Partition Mapping People’s Progressive Movement Period of Performance and Maintenance Pre-Assembled Power Module (wind turbines) Programme and Project Management (various organizations) Planning and Performance Management (various organizations) Piecewise Parabolic Method kRJ6B.