From WikiPilipinas: The Hip 'n Free Philippine Encyclopedia
In the Roman Catholic Church, secular clergy [or more precisely, diocesan clergy] are ordained ministers, such as deacons, priests [or more precisely, Presbyters] and Bishops, who do not belong to a religious order but to a particular church [e.g. diocese, vicariate apostolic, prelature apostolic, etc.]. While regular [or more precisely, religious] clergy take vows of chastity, poverty, and obedience and observe a rule (regulum) in a religious community, diocesan clergy make a promise of celibacy and of obedience to their diocesan bishop, living in the world (saeculum).
During the Spanish colonization of the Philippines, a number of intra-Church conflicts have occurred due to the tensions between regular [religious] and secular [diocesan] clergy.
One of the roots of the Philippine Revolution was the agitation of native secular [diocesan] clergy for parish assignments. The powerful religious orders were given preferential treatment in these assignments, and were usually Spaniards trained in Europe. The agitation contributed to the execution of the "GomBurZa filibusteros."