FAQ: What is a pecuniary interest? Share on Twitter Like on Facebook Share on LinkedIn Google Plus One Definition of PECUNIARY: (adjective) / of or relating to money In estate law, a pecuniary interest refers to one’s interest in an estate that relates to money. Likewise, a pecuniary loss refers to a loss that can be measured in terms of money. ANTONELLI & ANTONELLI – New York City Probate Attorneys and Estate Attorneys serving Manhattan, Brooklyn, Queens, Staten Island, and the Bronx. For more information about our services please visit our Probate page or learn more About Us. *Disclaimer: The above information is NOT legal advice and is for educational purposes only. You should always consult with an attorney directly to discuss the specific details of your case.