There are multiple definitions:

1. contingent negative variation(English)

   • BCI, EEG

2. copy number variant(English)

   • a variant in a genome where the number of copies of a large stretch of DNA differs from that in the reference genome; a copy can be deleted or be present more than once when being amplified or duplicated, triplicated, quadruplicated
   • CNP, DGV, FPES, SNP, SV, PEM
   • Genomics
   • https://www.gen…umber-Variation

3. choroidal neovascularization(English)

   • seen more with choroidal involvement and disruption of the Bruch's membrane. Causes of CNV include presumed ocular histoplasmosis syndrome, multifocal choroiditis and panuveitis, serpiginous choroiditis, and punctate inner choroidopathy
   • AMD, VEGF, PDT, PSV, iCNV, SC
   • Ophthalmology, Vascular disease
   • https://doi.org…000000000003290
   • https://pubmed.…h.gov/31869169/