The depth of snow accumulated on the ground. / (meteorology, chiefly Western US) The altitude, in a mountainous region, above which precipitation falls as snow.

(idiomatic) Sensible; rational; possessing sound judgment.

(tool) A tool employing a chamber with a colored liquid (usually alcohol, hence spirit) and an air bubble, used to determine a horizontal or vertical reference line.

(rail transport) An at-grade junction between two crossing railroad tracks.

(meteorology) The altitude at which the temperature of the atmosphere is 0°C at a specific location

The total chemical potential for electrons.

A delicate level pivoted so as to tilt when two parts of a measuring apparatus come into contact with each other; used in precise determinations of lengths and in the accurate graduation of instruments.

(often attributive) The level of the ground, the surface of the earth. / Ground floor (of a building) / (physics) Ground state, the stationary state of lowest energy of a particle.

Lowest, basic, unsophisticated level.

(idiomatic) The lowest, basic, least sophisticated level.