To deny privileges to someone, esp to keep someone confined at home as a punishment: If my father got a pair of bell-bottoms, I think I’d ground him
[1940s+; fr the practice of not permitting a pilot to fly, as a punishment, the word found by 1931]
noun 1. any of several terrestrial rodents of the squirrel family, as of the genus Citellus and chipmunks of the genus Tamias. circ;circ; noun 1. any burrowing sciurine rodent of the genus Citellus and related genera, resembling chipmunks and occurring in North America, E Europe, and Asia Also called gopher
noun, Physics. 1. the state of least energy of a particle, as an atom, or of a system of particles. noun 1. the lowest energy state of an atom, molecule, particle, etc Compare excited (sense 4) ground state n. The state of least possible energy in a physical system, as of atoms or molecules. ground […]
noun 1. . noun 1. a terminal equipped to receive, or receive and transmit, signals from or to communications satellites. earth station An on-ground radio communication site used for tracking, controlling, or otherwise communicating with spacecraft or satellites.
noun, Tennis. 1. a stroke made by hitting the ball after it has bounced from the ground. Compare (def 4b). noun 1. (tennis) any return made to a ball that has touched the ground, as opposed to a volley