The quality or state of being condensed; the characteristic of being compressed, compact, or expressed in few words.
From condensed + -ness suffix creating an abstract noun. The suffix -ness transforms adjectives into nouns that describe the quality or state of that adjective.
The 'condensedness' of a textbook—how much information is packed into few pages—is crucial to learning efficiency; textbooks that are too condensed can be confusing, while those that are too expanded waste time.
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