1) Approval 2) Favorable reception 3) Favourable reception 4) He accepted it on 
Appro was a developer of supercomputing supporting High Performance Computing (HPC) markets focused on medium to large-scale deployments. Appro was based in Milpitas, CA with a computing center in Houston, Texas, and a manufacturing and support subsidiary in Korea and Japan. Cray Inc. purchased Appro in November 2012. ==Company History== Appro was...
[n] - (British abbreviation) `he accepted it on appro`
noun an informal British abbreviation of approval; `he accepted it on appro`
(of a purchase) approval: on appro.