discordance

noun

1. a discordant state; disagreement; discord.
2. an instance of this.
3. dissonance.
4. Geology. lack of parallelism between adjacent strata, as in an angular unconformity.
5. (in genetic studies) the degree of dissimilarity in a pair of twins with respect to the presence or absence of a disease or trait.

noun

1. geology an arrangement of rock strata in which the older underlying ones dip at a different angle from the younger overlying ones; unconformity
2. lack of agreement or consonance
3. variants of discord

n.

1. The presence of a given genetic trait in only one member of a pair of identical twins.