Incorrect spelling, explanation: despite the fact that the double letter is not pronounced explicitly in occasion, the spelling stays true to the original word occasio, so while spelling such as ocasion may seem convincing, it’s not correct, as it’s occasion that properly showcases the Latin origin.

Correct spelling, explanation: occasion is a word borrowed from Latin occasio. In English, words naturally don’t end in o, so it was natural to add an n at the end, the pronunciation was also adjusted to fit well in English, but there were no further changes to the structure of the word, so the double c in occasion stayed as it was.

Definition of occasion:
noun
1. an opportunity, usually positive
This job provided me with an occasion to gain valuable experience.
2. a time when something happened
On multiple occasions, I missed my bus stop because I was so focused on reading.
3. an event or a ceremony
Katie has a great style and she can always dress well to fit the occasion.
verb
1. to bring something about
My car completely broke down which occasions me to use my bike more often.

Idioms with occasion:
Rise to the occasion – to do one’s best to meet the requirements of a difficult situation
He was nervous on his first day, but he rose to the occasion and was immediately seen as completely professional.
Sense of occasion – to have someone feel the importance of an event
The hall was beautifully decorated and there was live music which gave the place a sense of occasion.

Incorrect spelling

Incorrect spelling

Incorrect spelling

Incorrect spelling