This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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verb-intransitive. To take place; come about. See Synonyms at happen.

verb-intransitive. To be found to exist or appear: Copper deposits occur in the region.

verb-intransitive. To come to mind: The idea never occurred to me.

v. To happen or take place.

v. To present or offer itself.

v. To come or be presented to the mind; to suggest itself.

v. To be present or found.

verb-intransitive. To meet; to clash.

verb-intransitive. To go in order to meet; to make reply.

verb-intransitive. To meet one's eye; to be found or met with; to present itself; to appear.

verb-intransitive. To happen; to take place.

verb-intransitive. To come to the mind; to arise in the mind; to suggest itself; to be presented to the imagination or memory; -- of an idea or thought.

To run to, as for the purpose of assisting.

To run together; meet; clash.

To strike the senses; be found; be met with: as, silver often occurs native; the statement occurs repeatedly.

To emerge as an event into the actual world; happen; take place; come to pass; befall: as, what has occurred?

To strike the mind: with to.

Eccles., to coincide in time, so as to interfere each with the celebration of the other: as, two holy days occur.

To refer: with to.

Synonyms To come to pass, come about, fall out.

v. come to one's mind; suggest itself

v. come to pass

v. to be found to exist

"Richard’s first charter to the City (23 April, 1194) (166) granted a few weeks after his return from abroad makes no mention of a mayor, nor does the title occur in any royal charter affecting the City until the year"

occured    occures    occuring    occurred    occurring    occurs   

become   

be   

occurrent    occurrence   

occurring    occurred   

arise    shine    chance    supervene    roll around    come around    break    materialise    anticipate    proceed   

appear    happen   

Burr    Fleur    Fur    Kerr    Monsieur    Shir    Sir    Spur    Thur    Ur