Definitions of labour:

noun: productive work (especially physical work done for wages)
noun: a social class comprising those who do manual labor or work for wages
noun: a political party formed in Great Britain in 1900; characterized by the promotion of labor's interests and the socialization of key industries
noun: concluding state of pregnancy; from the onset of labor to the birth of a child
verb: work hard
verb: undergo the efforts of childbirth
verb: strive and make an effort to reach a goal