DELETION By N., Pam M.S. - April 7, 2013 1. Genetics. Mutation where genetic material is lost from the chromosome.2. Genera 5 grammar. Part of a sentence is deleted but we still know what is meant. See ellipsis. DELETION: "Deletion has been the study of sentence processing." Related Psychology Terms MUTATION TRANSLOCATION GENE SPLICING GRAMMATICALITY FINITE-STATE GRAMMAR GENETIC DISORDER GENETIC DEFECT AUXILIARY INVERSION CONSTITUENT OBLIGATE CARRIER Cite this page: N., Pam M.S., "DELETION," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/deletion/ (accessed March 25, 2019).