Workforce
Workforce (development) in the Stellaris encyclopedia: Workforce represents the collective labor capacity of a Colony, reflecting the number of individuals available to perform various tasks essential to the empire's functioning.
Workforce in the game's words
The encyclopedia entry as the game shows it in its tooltips; underlined words open their own entry or page here.
Workforce represents the collective labor capacity of a 
Colony, reflecting the number of individuals available to perform various tasks essential to the empire's functioning.
Pops are organized into groups based on shared characteristics such as Species, social strata, and Ethics. Each group contributes to the planet's Workforce, which is then allocated to fill available 
Jobs.
More in Development
Source: common/game_concepts (concept_workforce) and localisation/english, Stellaris Cygnus v4.5.2 (9776).