What is the most common misspelled word with 11 letters?

This is a bit of a tricky question! There isn't really a definitive answer to "most commonly misspelled word" as it depends on factors like:

* Region: Misspellings can vary depending on where you are.

* Context: Some words are more likely to be misspelled in specific contexts (like technical writing).

* Individual spelling ability: People have different levels of spelling proficiency.

However, some words with 11 letters that are commonly misspelled include:

* definitely: People often forget the double "f" and "n."

* occasionally: This word often gets confused with "occasion," so people might miss the extra "l."

* necessary: Many people misspell this as "neccessary."

It's important to remember that there's no single "most misspelled" word. It's more about being aware of common spelling errors and using resources like dictionaries and spellcheckers to improve our accuracy.