selectivity

selective +‎ -ity

selectivity (countable and uncountable, plural selectivities)

1. The quality of being selective; usually the extent to which something is selective.(Can we add an example for this sense?)
2. The ability of a radio receiver to separate a desired signal frequency from others.
3. (chemistry) Discrimination of a reactant towards a choice of other reactants; the ratio of rate constants for different reactants.

• selectiveness