birth in WordNet English dictionary

1. cause to be born
   "My wife had twins yesterday!"
   give birth  deliver  bear  birth  have 
   

1. the event of being born
   "they celebrated the birth of their first child"
   birth  nativity  nascency  nascence 
   
2. a baby born; an offspring
   "the overall rate of incidence of Down's syndrome is one in every 800 births"
   birth 
   
3. the process of giving birth
   parturition  birth  giving birth  birthing 
   
4. the kinship relation of an offspring to the parents
   parentage  birth 
   
5. the time when something begins (especially life)
   "they divorced after the birth of the child"; "his election signaled the birth of a new age"
   birth