<p>Here's a pretty good definition from Wikipedia. As it says the original definition means arts appropriate for free men (from the latin liber=free):</p>
<p>The term liberal arts has come to mean studies that are intended to provide general knowledge and intellectual skills, rather than more specialized occupational, scientific, or artistic skills.</p>
<p>The scope of the liberal arts has changed with society. It once emphasised the education of elites in the classics; but, with the rise of other humanities during the Age of Enlightenment, the scope and meaning of "liberal arts" expanded to include them. Still excluded from the liberal arts are topics such as agriculture, business, dentistry, engineering, chemistry, medicine, pedagogy (school-teaching), music, physics, and pharmacy.</p>
<p>In the history of education, the seven liberal arts comprised two groups of studies: the trivium and the quadrivium. Studies in the trivium involved grammar, dialectic (logic), and rhetoric; and studies in the quadrivium involved arithmetic, music, geometry, and astronomy. These liberal arts made up the core curriculum of the medieval universities. The term liberal in liberal arts is from the Latin word liberalis, meaning "appropriate for free men" (social and political elites), and they were contrasted with the servile arts. The liberal arts thus initially represented the kinds of skills and general knowledge needed by the elite echelon of society, whereas the servile arts represented specialized tradesman skills and knowledge needed by persons who were employed by the elite.</p>
<p>In the United States, liberal arts colleges are still a particular kind of higher education institution that are typified by their rejection of more direct vocational education during undergraduate studies. Following completion of their undergraduate studies at liberal arts colleges, graduates often do obtain specialized training by going to other institutions, such as professional schools (for instance, in business, law, medicine, or theology) or graduate schools.</p>