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English definition of “split infinitive”

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split infinitive

noun [C] uk   specialized us  
a phrase in which an adverb or other word is put between "to" and an infinitive . Some people consider split infinitives to be bad grammar, but they are becoming generally acceptable: "To boldly go" is an example of a split infinitive.
(Definition of split infinitive from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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