Definitely or Definately?

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The most recent, flagrant misspelling I've seen is the word DEFINITELY, spell incorrectly as DEFINATELY.

We’ll start with a definition because I think that will help you remember how to spell it correctly:

DEFINITE or DEFINITELY = limits, such as finite <Merriam-webster online>.

The etymology (history of a word) shows that it comes from the word FINITE, which will also help you remember how to spell it.

Since you know that FINITE is spelled with an I and not an A, you should have no problems remembering, now, that DEFINTELY is definitely not spelled DEFINATELY.