Occur

1. v. i. To meet or come to the mind; to suggest itself; to be presented to the imagination or memory.
2. v. i. To meet; to clash.
3. v. i. To go in order to meet; to make reply.
4. v. i. To meet one’s eye; to be found or met with; to present itself; to offer; to appear; to happen; to take place; as, I will write if opportunity occurs.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.