In the sense of "intentionally", "not by accident", the usual word, in everyday contexts, is "purposely" (just as common is "on purpose"). "Knowingly" can also be used in this sense, but it seems more formal -- the sort of word you might expect to see in a transcript of court proceedings, for example. " "The prosecution claimed that the defendant knowingly made a false declaration" "Knowingly" can also mean "in such a way as to indicate special knowledge or understanding of the situation".
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little_catI think "knowingly" makes the meaning become kind of negative (the action that has been done is bad or dishonest).