Incorrect spelling, explaination:
definetly is incorrect, because suffix -ly should be added to a full form adjective to make an adverb: definite and the suffix gives the correct spelling: definitely.
Correct spelling, explaination: the correct form, definitely, is an adverb originating from the adjective. To make an adverb form out of an adjective suffix -ly is added. Definite (meaning something sure, ended without a doubt) + -ly makes the correct spelling definitely. According to this rule
definetly is the wrong spelling.
Definition of definitely:
1. adverb, with no doubt, unambigously
Chris performed definitely better than the rest of the cast.
Definetely you shouldn’t do that.
2. an interjection to emotionally agree with/to something
Kate is just so annoying! – Definitely!
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