The quality or state of being assentive; the characteristic of tending toward or expressing agreement.
Formed from 'assentive' (adjective) plus the noun-forming suffix '-ness', which creates abstract nouns describing qualities or states. Extremely rare in actual usage.
This word represents a unique phenomenon in English: the '-ness' suffix lets us turn almost any adjective into an abstract noun, creating potentially infinite words that almost no one uses—'assentiveness' could theoretically exist, but probably hasn't appeared in print in over 150 years.
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