workday

Short definition from Wiktionary

Noun

1. 1
   Any of the days of a week on which work is done; any day in a workweek. The five workdays in many countries are usually Monday to Friday (and are defined as such in official and legal usage even though many people work on weekends).
2. 2
   That part of a day in which work is done.

Adjective

1. 1
   Alternative form of workaday.