SPLIT INFINITIVE • DICCIONARIO INGLES.COM • Definition of Split infinitive

... I do not like the same word repeated in the same paragraph, though this lays a heavy tax on so-called synonymes. Assonances jar me, even two terminations "tion" near together. I will not knowingly use "that" for "which," except to avoid two "whiches" between the same two periods. The split infinitive I abhor, more as a matter of taste than argument. I recognize that it is at times very tempting to snuggle the adverb so close to the verb; but I hold fast my integrity. Once, indeed, I took it into my head not to split compound tenses, and carried this fad somewhat remorselessly through ...

— From Sail to Steam, Recollections of Naval Life • Captain A. T. Mahan