The Collaborative International Dictionary
Miscibility \Mis`ci*bil"i*ty\, n. [Cf. F. miscibilit['e].] Capability of being mixed.
Wiktionary
n. 1 The property of being able to be mixed. 2 The degree to which two things mix.
Wikipedia
Miscibility is the property of substances to mix in all proportions (that is, to fully dissolve at any concentration), forming a homogeneous solution. The term is most often applied to liquids, but applies also to solids and gases. Water and ethanol, for example, are miscible because they mix in all proportions.
By contrast, substances are said to be immiscible if a significant proportion does not form a solution. Otherwise, the substances are considered miscible. For example, butanone is significantly soluble in water, but these two solvents are not miscible because they are not soluble in all proportions.
Usage examples of "miscibility".
Most alloys have to be formed at high temperatures because of miscibility problems, among other things.