Correct spelling: explanation: the word has got the Latin origin cadere (meaning to fall) in past participle form, which created the word occasio. There is no double s in the correct spelling – occasion, so occassion is not correct.

Definition of occasion:
1. noun, an event, special time, for example, a party
For the occasion of her prom, she bought a long gown.
Let’s open champagne on the occasion of getting promoted!
2. noun, a specific time something happens or happened
I had a great discussion with Tom on one occasion.
3. (rare) verb, to create an occasion for something to happen
This situation occasioned us a lot of fun.

Idioms and phrases with occasion:
→ on occasion, sometimes, from time to time: We see each other on occasion.
→ rise to the occasion, to do better than usual on some special event, to perform very well despite difficulties: They had been pretty good at the rehearsals, but at the premiere, they rose to the occasion!

Incorrect spelling, explanation: the correct spelling occasion hasn’t got double consonant s just like its Latin origin. Occassion is thus a wrong form.

Incorrect spelling

Incorrect spelling

Incorrect spelling

Incorrect spelling