aprāpti: Non-acquisition, one of the viprayukta-saṃskāra-dharma-s. It is a force opposite in nature to prāpti, and serves to severe the link of a dharma from the serial continuity of the sentient being.

Sarvastivada Abhidharma, Sanskrit-English Glossary, by Bhikkhu KL Dhammajoti

a-prâpti f. non-attainment, non-acquisition

Sanskrit-English Dictionary, by M. Monier William