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The correct spelling is definitely.
Not definately.
Not definatly.
Not definantly.
Not definetly.
Not definently.
And certainly not defiantly.
The correct spelling is definitely.
I had to google how to spell definitely, I was spelling it defenitely and my spell check thingy for chrome was only giving me to option to change it to definitively.
Whats words, if any, do you mess up a lot when spelling them?