1. productive work (especially physical work done for wages)

e.g. his labor did not require a great deal of skill

Synonym: labortoil

2. a social class comprising those who do manual labor or work for wages

e.g. there is a shortage of skilled labor in this field

Synonym: laborworking classproletariat

3. concluding state of pregnancy
from the onset of contractions to the birth of a child

e.g. she was in labor for six hours

Synonym: parturiencylaborconfinementlying-intravailchildbed