pe ‧ cu ‧ ni ‧ a ‧ ry /pɪˈkjuːniəri $ -nieri/ BrE AmE adjective formal
[ Date: 1500-1600 ; Language: Latin ; Origin: pecuniarius , from pecunia 'money, wealth in cattle' , from pecus 'cattle' ]
relating to or consisting of money ⇨ financial :
He was trying to get a pecuniary advantage for himself.