occur

verb4

1. •
   to take place, especially at a certain time or in a certain place

   • The liftoff will occur in exactly twelve seconds.
2. •
   To present or offer itself.

   • I will write if the opportunity occurs.
3. •
   To come or be presented to the mind; to suggest itself.

   • One little incident of my school days occurs to me as amusing.
   • It occurred to him to tell me of the problem.
4. •
   To be present or found.

   • The chemical monofluoroacetate occurs in all parts of Dichapetalum cymosum, and is responsible for its toxic effects.