Correct spelling, explanation: the correct spelling derives from the old English origin which is to morrow meaning to morning. We kept the original spelling, so the form tommorrow is not correct.

Definition of tomorrow:
1. noun, the next day after today
I can’t go out, I have a test tomorrow.
If it doesn’t rain tomorrow, we can have a picnic in the park near my office.
Will you call me tomorrow?
Although I’m feeling a bit under the weather today, I hope to be feeling better by tomorrow.
2. noun, sometime in the future
I’m so excited to see what adventures tomorrow will bring, as I never know what to expect.
Tomorrow will be better, I promise.
I’m excited to see what the world will look like tomorrow, and I’m hopeful that it will be a better place for all of us.
I can’t wait to see what amazing inventions and discoveries will be made tomorrow.

Idioms and phrases with tomorrow:
Here is a list of the most popular expressions with the word tomorrow:
→ tomorrow is another day – one should hope that problems will be gone soon and the future will be better,
Remember that tomorrow is another day so we should hope for the best.
→ tomorrow is a new day – every day is a new opportunity to start fresh and make positive changes,
I’m feeling pretty overwhelmed today, but I know that tomorrow is a new day and I’ll be able to tackle my to-do list with a fresh perspective.
→ tomorrow never dies – the future is always uncertain and it is impossible to predict what will happen (this phrase is the title of a James Bond movie),
I keep telling myself that I’ll start working on my project tomorrow, but somehow tomorrow never dies and I never seem to get around to it.
→ tomorrow is a mystery – the future is unknown and unknowable,
I have no idea what tomorrow will bring, but I’m excited to find out.
→ tomorrow is the first day of the rest of your life – every day is a new opportunity to start fresh and make positive changes,
I know I made some mistakes yesterday, but I’m going to try to do better tomorrow because tomorrow is the first day of the rest of my life.
→ tomorrow is another chance to get it right – every day provides an opportunity to improve upon the previous day,
I didn’t do very well on my exam today, but I’m going to study harder tomorrow because tomorrow is another chance to get it right.

Incorrect spelling, explanation: we don’t double the m in the word due to its old English origin, therefore the only correct form is tomorrow.

Incorrect spelling

Incorrect spelling

Incorrect spelling

Incorrect spelling