The quality or state of being distinguishable; the degree to which something can be told apart from other things.
Formed by adding -ness to distinguishable, creating an abstract noun. This pattern of adding -ness to adjectives is one of English's most productive word-building strategies, dating back to Old English.
Stacking suffixes like this (-able + -ness) creates words that feel clunky but are incredibly precise—it's like English trying to describe the *abstract property of being recognizable*, which is hard to do in one word.
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