WordReference Collins English Usage © 2019
Altogether means ‘completely’.
The noise had stopped altogether.
We need an altogether different plan.
Adverbs and adverbials (for a graded list of words used to indicate extent)
You also use altogether to show that an amount is a total.
You will get £340 a week altogether.
‘all together’
Don't confuse altogether with all together. You use all together to say that a group of people or things are together or do something together, and that none of them is missing.
It had been so long since we were all together – at home, secure, sheltered.

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