single nucleotide variant

Definition of single nucleotide variant
National Cancer Institute

single nucleotide variant

(SING-gul NOO-klee-oh-tide VAYR-ee-unt)
A DNA sequence variation that occurs when a single nucleotide (adenine, thymine, cytosine, or guanine) in the genome sequence is altered. Single nucleotide variants may be rare or common in a population. Sometimes single nucleotide variants are referred to as single nucleotide polymorphisms if they are present in at least 1% of the population. Also called SNV.

Source: NCI Dictionary of Cancer Terms