Origin: Latin suffix -al
Preferential has 2 different meanings across 1 category:
manifesting partiality
"a discriminatory tax"
"preferential tariff rates"
"preferential treatment"
"a preferential shop gives priority or advantage to union members in hiring or promoting"
Of or relating to the showing or giving of preference.
"The bank offered preferential interest rates to customers who had maintained their accounts for over a decade."