The solid surface of the earth. An area of knowledge or subject of discussion or thought. Factors forming a basis for action or the justification for a belief. A prepared surface to which paint is applied. Solid particles, especially of ground coffee, that form a residue; sediment. Electrical connection of a circuit or conductor to the earth. Prohibit or prevent (a pilot or an aircraft) from flying. (with reference to a ship) run or go aground. Give (something abstract) a firm theoretical or practical basis. Place or lay (something) on the ground or hit the ground with it. Connect (an electrical device) with the ground. (of a batter) hit a pitched ball so that it bounces on the ground. Reduced to fine particles by crushing or mincing.