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Definition of Nominal variable

Nominal variable Definition from Science & Technology Dictionaries & Glossaries
Electronic Statistics Textbook
Variables which take on one of a set of discrete values, such as Gender={Male, Female}. In neural networks, nominal output variables are used to distinguish classification tasks from regression tasks. See also, Grouping (or Coding) Variable and Measurement scales.
Common Concepts in Statistics
A qualitative variable defined by mutually exclusive unordered categories such as blood groups, races, sex etc. (see also ordinal variable).
Nominal variable Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
In statistics and quantitative research methodology, various attempts have been made to classify variables (or types of data) and thereby develop a taxonomy of levels of measurement or scales of measure. Perhaps the best known are those developed by the psychologist Stanley Smith Stevens. He proposed four types: nominal, ordinal, interval, and ratio.

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