noun
or as·sien·to ˌasēˈen(ˌ)tō, ˌäs-
( -s )
Etymology: Spanish asiento seat, meeting place of a tribunal, treaty, contract, from asentar to seat, make an agreement, from a- (from Latin ad- ) + sentar to seat
: a contract or convention between Spain and another power or company or individual for furnishing Negro slaves for the Spanish dominions in America