noun (n)

• a day on which work is done(noun.time)

  Synonym:
  work day, working day
  Antonym:
  day of rest, rest day
  

  source: wordnet30
• the amount of time that a worker must work for an agreed daily wage(noun.time)

  Synonym:
  working day
  

  source: wordnet30
• A day on which work is performed, as distinguished from Sunday, festivals, etc., a working day.(noun)

  source: webster1913