1.NounAn epigenetic interaction between an allele on one chromosome and the corresponding allele on the homologous chromosome
"Transvection effects include both activation and silencing."
2.NounA kind of linear mapping which leaves all points on one axis fixed, while other points are shifted parallel to the axis by a distance proportional to their perpendicular distance from the axis
"a projective transvection"
3.NounThe act of supernatural flight, such as by a witch.