The trick: lock in CC + RR
Most misspellings of occurrence drop one double letter: occurence or occurance. The reliable fix: always write the middle as CC + U + RR.
Mnemonic:
Two Cops Run Rapidly at every occurrence.
Two Cops = CC, Run Rapidly = RR.
occurence
missing one R
occurance
wrong vowel + missing R
ocurrence
missing one C
ocurrance
missing C + wrong vowel
Practice with real sentences
Rain in April is a common occurrence here.
That software crash was a one-time occurrence.
Teacher conferences are a weekly occurrence this month.
Seeing deer at dawn is a regular occurrence on this road.
Spot the correct spelling
occurence
occurrence
occurance
ocurrence
Related words to reinforce the pattern
Also read How to Spell Accommodate and How to Spell Unnecessary for more double-letter traps.
FAQ
What is the correct spelling of occurrence?
Occurrence: O-C-C-U-R-R-E-N-C-E.
Why is occurrence hard to spell?
Because pronunciation masks the doubled consonants. Writers often remove one C or one R by accident.
What's a trick to remember how to spell occurrence?
Say: “Two Cops Run Rapidly.” That forces CC + RR in the center of occurrence.