1. A day on which work is done
   "In many countries, Saturday is not considered a workday";
   - working day, work day
    
2. The amount of time that a worker must work for an agreed daily wage
   "His workday typically lasted eight hours";
   - working day

1. A unit of measurement for work or labour, representing the amount of work one person can do in one day; used to estimate or quantify the total human effort required for a project or task
   "The software development was estimated to take 200 work days";
   - man-day

Derived forms: work days, workdays

Type of: day, weekday

Encyclopedia: Workday, Inc