Grounds is a 3rd person present and plural noun for a word "GROUND."
1. Prohibit or prevent (a pilot or an aircraft) from flying.
2. (With reference to a ship) run or go aground.
3. Give (something abstract) a firm theoretical or practical basis.
4. The solid surface of the earth.
5. An area of land or sea used for a specified purpose.
1. Shore dumping can pollute fishing grounds.
2. The school has four grounds for students.