A system under which a nominally free personal course or a religious, national, or racial minority is permanently oppressed and degraded.
A type of symbiosis, as among specific ants, by which one species is principal and helps make the people in another species perform the jobs needed for their shared success.
The permanent oppression of a nominally no-cost group of people
A form of symbiosis where one species is forced to do jobs for another, because of their shared benefit
the health of the Helots or slaves in Sparta; slavery.
The upkeep, by creatures of one species, of people of another species in return for their particular labor as servants.
In botany, a peculiar type of symbiosis in which one organism bears to a different the connection of servant to perfect; noting especially the connection of algal towards fungal part of a lichen: against mutualistic symbiosis..