noun a male parent (also used as a term of address to your father)
noun the founder of a family
noun `Father' is a term of address for priests in some churches (especially the Roman Catholic Church or the Orthodox Catholic Church); `Padre' is frequently used in the military
noun (Christianity) any of about 70 theologians in the period from the 2nd to the 7th century whose writing established and confirmed official church doctrine; in the Roman Catholic Church some were later declared saints and became Doctor of the Church; the best known Latin Church Fathers are Ambrose, Augustine, Gregory the Great, and Jerome; those who wrote in Greek include Athanasius, Basil, Gregory Nazianzen, and John Chrysostom
noun God when considered as the first person in the Trinity
noun a person who founds or establishes some institution
noun the head of an organized crime family
Source: WordNet 3.1, Princeton University