RPA

1. abbreviationinitialismInitialism of Rural Payments Agency.

plural RPAs

1. abbreviationcountableinitialismuncountableInitialism of remotely piloted aircraft.
2. abbreviationcountableinitialismuncountableInitialism of robotic process automation.
3. abbreviationcountableinitialismuncountablenatural sciencesInitialism of random phase approximation.

   An even higher-level method is the GW and the related random-phase approximation (RPA)^(8,9), but the high computational cost of RPA makes it only applicable to small systems¹⁰.

   2016 April 26, Jie Ma, Lin-Wang Wang, “Using Wannier functions to improve solid band gap predictions in density functional theory”, in Scientific Reports, volume 6, →DOI, article 24924, page 1

plural RPAs

1. QuebecPrivately-operated retirement home