Nouveau Petit Larousse illustré. Dictionnaire encyclopédique. Paris, Librairie Larousse, 1952, 146th edition
Etymology
From Latinlāicus(“lay, layman, laic”), from Ancient Greekλαϊκός(laïkós, “of the people”), from λαός(laós, “the people”). Doublet of lai(“lay, not belonging to the clergy”).