Webster's Dictionary 
(1): ( a.) Uncultured; commonplace.
(2): ( a.) Of or pertaining to the Philistines.
(3): ( n.) A native or an inhabitant of ancient Philistia, a coast region of southern Palestine.
(4): ( n.) A bailiff.
(5): ( n.) A person deficient in liberal culture and refinement; one without appreciation of the nobler aspirations and sentiments of humanity; one whose scope is limited to selfish and material interests.
Cyclopedia of Biblical, Theological and Ecclesiastical Literature 
Bibliography Information McClintock, John. Strong, James. Entry for 'Philistine'. Cyclopedia of Biblical, Theological and Ecclesiastical Literature. https://www.studylight.org/encyclopedias/eng/tce/p/philistine.html. Harper & Brothers. New York. 1870.
The Nuttall Encyclopedia 
The name given by the students in Germany to a non-university man of the middle-class, or a man without (university) culture, or of narrow views of things.