Synonym: utility. Similar words: carefulness, wastefulness, wakefulness, gracefulness, gratefulness, peacefulness, resourcefulness, joyfulness. Meaning: [juːsfʊlnɪs] 
n. the quality of being of practical use.
n. the quality of being of practical use. 
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181. Transillumination has been improved in its usefulness in the diagnosis of breast diseases by the addition of computerized infrared light scanning techniques.
More similar words: carefulness, wastefulness, wakefulness, gracefulness, gratefulness, peacefulness, resourcefulness, joyfulness, forgetfulness, helpfulness, painfulness, playfulness, truthfulness, watchfulness, cheerfulness, unlawfulness, thankfulness, faithfulness, wonderfulness, thoughtfulness, fullness, useful, usefully, be useful to, remorseful, purposeful, suspenseful, purposefully, illness, wellness.