recruitment
noun
[ rɪˈkruːtm(ə)nt ]
• the action of enlisting new people in the armed forces.
• "methods of military recruitment"
• the increase in a natural population as progeny grow and new members arrive.
• "the black-tailed deer is notoriously capable of population recruitment after numbers are depleted"
• the incorporation of cells from elsewhere in the body into a tissue or region.
• "inflammatory cell recruitment"