WordReference Random House Learner's Dictionary of American English © 2014
prac•ti•cal•i•ty /ˌpræktɪˈkælɪti/USA pronunciation n. 

    the part of something that deals with or concerns practical events as opposed to theory: [uncountable]a sense of practicality in dealing with problems.[countable]You can't ignore the practicalities.

Collins Concise English Dictionary © HarperCollins Publishers::

practical /ˈpræktɪkəl/ adj
  1. of, involving, or concerned with experience or actual use; not theoretical
  2. of or concerned with ordinary affairs, work, etc
  3. adapted or adaptable for use
  4. of, involving, or trained by practice
  5. being such for all useful or general purposes; virtual
  1. an examination in the practical skills of a subject: a science practical
Etymology: 17th Century: from earlier practic, from French pratique, via Late Latin from Greek praktikos, from prassein to experience, negotiate, perform

ˌpractiˈcality, ˈpracticalness n USAGE
A distinction is usually made between practical and practicable. Practical refers to a person, idea, project, etc, as being more concerned with or relevant to practice than theory: he is a very practical person; the idea had no practical application. Practicable refers to a project or idea as being capable of being done or put into effect: the plan was expensive, yet practicable

'practicality' also found in these entries:
In the English description:

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