Entry 2 senses Webster, 1913 Pneumatology · Pneu·ma·tol·o·gy · IPA /ˌnjuː.məˈtɒ.lə.d͡ʒi/ 01 n. The doctrine of, or a treatise on, air and other elastic fluids. See Pneumatics, 1. 1. The doctrine of, or a treatise on, air and other elastic fluids. See Pneumatics, 1. See: Pneumatics 2. The science of spiritual being or phenomena of any description.(Philos. & Theol.)