happen in WordNet English dictionary

1. happen, occur, or be the case in the course of events or by chance
   "It happens that today is my birthday"; "These things befell" (Santayana)
   happen  befall  bechance 
   
2. come upon, as if by accident; meet with
   "We find this idea in Plato"; "I happened upon the most wonderful bakery not very far from here"; "She chanced upon an interesting book in the bookstore the other day"
   find  happen  chance  bump  encounter 
   
3. come to pass
   "What is happening?"; "The meeting took place off without an incidence"; "Nothing occurred that seemed important"
   happen  hap  go on  pass off  occur  pass  fall out  come about  take place 
   
4. come into being; become reality
   "Her dream really materialized"
   happen  materialize  materialise 
   
5. chance to be or do something, without intention or causation
   "I happen to have just what you need!"
   happen