If I had known that there was a reference column on the left,
I wouldn't have looked up the phrasal verb in the several dictionaries.
:x

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Fill in = complete a form (UK)
I FILLED IN the application form and posted it off.

Fill out = complete a form (US)
I FILLED OUT the application form and mailed it.

http://www.usingenglish.com/referenc...l-verbs/f.html
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"fill in" and "fill out" are clearly explained on your site.

Good site! :D