The Nuttall Encyclopedia
Elevated spots on which altars were erected for worship in the rude belief that, as they were nearer heaven than the plains and valleys, they were more favourable places for prayer. The practice of worship on these spots, though from the first forbidden, became frequent among the Jews, and was with difficulty abolished, though denounced time after time by the prophets as an affront to Jehovah.
Wood, James, ed. Entry for 'High Places'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/h/high-places.html. Frederick Warne & Co Ltd. London. 1900.