At graduation [Pierre Simon] Laplace faced an anguishing dilemma. His master’s degree permitted him to take either the priestly vows of celibacy or the title of abbé, signifying a low-ranking clergyman who could marry and inherit property. Abbés did not have good reputations; Voltaire called them “that indefinable being which is neither ecclesiastic nor secular . . . young men, who are known for their debauchery.” An engraving of the period, “What Does the Abbé Think of It?” shows the clergyman peering appreciatively down a lady’s bosom as she dresses. Still, the elder Laplace wanted his son to become a clergyman. If Laplace had been willing to become an abbé, his father might have helped him financially, and Laplace could have combined church and science. A number of abbés supported themselves in science, the most famous being Jean Antoine Nollet, who demonstrated spectacular physics experiments to the paying public.
Source: wiktionary