#usefulness__utility  the quality of being of practical use
  exclusion:  #inutility
  supertype:  #quality  an essential and distinguishing attribute of something or someone; "the quality of mercy is not strained"--Shakespeare
  subtype:  #detergency__detergence  detergent quality; the quality of having cleansing power
  subtype:  #function.usefulness__purpose__role__use  what something is used for; "the function of an auger is to bore holes"; "ballet is beautiful but what use is it?"
     subtype:  #raison_d'etre  the purpose that justifies a thing's existence
  subtype:  #helpfulness__helpfulnes  the property of providing useful assistance
     subtype:  #avail__help__service  a means of serving; "of no avail"; "there's no help for it"
  subtype:  #use  a particular service; "he put his knowledge to good use"; "patrons have their uses"
  subtype:  #serviceability__serviceableness__serviceablenes__usablenes  the quality of being able to provide good service
  subtype:  #instrumentality.usefulness  the quality of being instrumental for some purpose
  subtype:  #practicality  concerned with actual use rather than theoretical possibilities
     subtype:  #functionality  capable of serving a purpose well; "software with greater functionality"
     subtype:  #viability.practicality  capable of become practical and useful
     subtype:  #sensibleness  the quality of showing good sense or practical judgment
     subtype:  #realism  the attribute of accepting the facts of life and favoring practicality and literal truth
  subtype:  #practicability__practicableness__practicablenes  the quality of being usable
     subtype:  #feasibility__feasibleness  the quality of being doable

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