In dr. jekyll's final letter to mr.utterson he notes that he altered his will so that he could become edward hyde "without pecuniary loss." what dose the word pecuniary mean?

"Pecuniary" is an adjective that defines something concerning money, or something that is related to money. In this case, the phrase "pecuniary loss" describes a financial loss. Dr. Jekyll was concerned about being able to use his money when he became Mr. Hyde. This is the main reason why he decided to alter his will.