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A split infinitive is a controversial grammatical construction specific to English in which an adverb or adverbial phrase appears in a to-infinitive phrase between the "to" and the bare infinitive verb of the infinitival phrase "to verb", as "to adverb verb". The adverb is said to "split" the infinitive. The to-infinitive is also known as the full infinitive.

An example is in the opening sequence of the Star Trek television series: "to boldly go where no man has gone before", where the adverb boldly splits the to-infinitive, to go. Multiple words may also separate the elements of a to-infinitive (such as in "population is expected to more than double by 2050"), forming a compound infinitive. (Full article...)