Noun
1. productive work (especially physical work done for wages);
"his labor did not require a great deal of skill"2. a social class comprising those who do manual labor or work for wages;
"there is a shortage of skilled labor in this field"3. concluding state of pregnancy; from the onset of labor to the birth of a child;
"she was in labor for six hours"4. an organized attempt by workers to improve their status by united action especially via labor unions (especially the leaders of this movement)
5. any piece of work that is undertaken or attempted;
"he prepared for great undertakings"