labor in WordNet English dictionary

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

1. work hard
   "She was digging away at her math homework"; "Lexicographers drudge all day long"
   labor  labour  toil  fag  travail  grind  drudge  dig  moil 
   
2. strive and make an effort to reach a goal
   "She tugged for years to make a decent living"; "We have to push a little to make the deadline!"; "She is driving away at her doctoral thesis"
   tug  labor  labour  push  drive 
   
3. undergo the efforts of childbirth
   labor  labour