labor relations

:  expenditure of physical or mental effort especially when difficult or compulsory

:  human activity that provides the goods or services in an economy

:  the services performed by workers for wages as distinguished from those rendered by entrepreneurs for profits

:  to exert one's powers of body or mind especially with painful or strenuous effort :  work

:  to move with great effort

:  to be in the labor of giving birth

:  of or relating to labor

:  of, relating to, or constituting a political party held to represent the interests of workers or made up largely of organized labor groups

:  the act of telling or recounting :  account

:  an aspect or quality (such as resemblance) that connects two or more things or parts as being or belonging or working together or as being of the same kind

:  a property (such as one expressed by is equal to, is less than, or is the brother of) that holds between an ordered pair of objects