Genetic/dʒəˈnetɪk/ Definition 1 of 3Pro Tip 1/3Heredity Matters Indicates traits or disorders passed down through family lines. Their genetic similarities are because they're twins. Pro Tip 2/3Not Contagious Genetic conditions are inherited, not caught from someone else. His genetic condition isn't something you can catch. Pro Tip 3/3Family Health History Knowing family health can hint at genetic predispositions. The doctor asked about my family's genetic history.