The quality or condition of being desirable; the state of being worthy of being wanted or sought after.
Formed from 'desirable' plus the Germanic suffix '-ness,' an alternative to the Latinate '-ity.' Both suffixes create nouns from adjectives, but '-ness' is older and more rooted in English tradition.
English gives us two ways to say the same thing: 'desirability' (fancy, Latin) and 'desirableness' (plain, Germanic). Interestingly, 'desirability' sounds more modern and technical, while 'desirableness' feels more old-fashioned—showing how word choice changes over time.
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