The quality of being practical; practicality.(noun)
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Use "practicalness" in a sentence
"Its outstanding features are its "practicalness", and its bright, easy, vivacious style."
"Whether it provides a lively personality to the bedroom or finds the best solution for a bedroom for two, GAB is capable of satisfying all the needs for design and practicalness."
"Apart from all the apple crapple (I am a dual computer user myself) i do think that many comments here are very valid, its a pity that designers with all the flair and “floweryness” cannot come up with the concrete “practicalness” that is required from a really useful desk like;"