How to define slavery?

Does it mean laboring without adequate compensation?

Does it mean having one’s mobility restricted?

Does it mean having one’s associations limited?

Does it mean being owned by another person and used/abused by him/her?

Does it mean one has no standing in the law?

Does it mean being deprived of natural rights?

Does it mean being caged like another animal species?

Is it a synonym for coercion? The absence of liberty?