The state or quality of being tangled, twisted, or trapped together.
From 'entangled' plus '-ness' (the suffix forming abstract nouns from adjectives). '-ness' is Old English in origin and has been English's primary tool for creating noun forms from qualities since Anglo-Saxon times.
English speakers can add '-ness' to almost any adjective to express its abstract quality (happiness, sadness, weirdness), and this flexibility made English ideal for scientific and philosophical writing where authors need exact nouns for concepts.
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