Correct spelling, explanation: occasion, like many English words, has its roots in Latin, precisely in the word occasio. The spelling changed slightly over time, and the pronunciation is certainly different from the original Latin one, but the fact that we no longer pronounce the cc as two separate c’s in occasion does not influence the spelling.

Definition of occasion:
noun
1. a situation providing an opportunity for something
The family gathering seems like a great occasion to announce her pregnancy.
2. a specific time when something happens
On one occasion I forgot the keys to my apartment and had to wait on the staircase.
3. a day of special significance or a formal event
This shop has a dress for any occasion, from weddings to funerals.
verb
1. to cause something
There are some technical issues that may occasion the concert to be canceled.

Idioms with occasion:
To do something on occasion – to do something once in a while; sometimes
I generally don’t smoke but on occasion, I like to have a cigar.
Take the occasion – to seize a good opportunity
When my dog saw me opening the door, he took the occasion and ran out to the garden.

Incorrect spelling, explanation: the pronunciation of occasion does not specify whether the word is spelled with two c’s or one, as ocasion, so it may be a little tricky. It’s worth remembering, though, that many words come from Latin, and double consonants are quite popular there. In this case, the original word was spelled occasio, so the double c is certainly correct.

Incorrect spelling

Incorrect spelling

Incorrect spelling

Incorrect spelling