(chemistry) The energy level of the electrons (core electrons) occupying the completely filled shells under the valence shell.

The nominal height of the surface of the oceans above which heights of geographical features and aircraft flight levels are measured.

Taking place or existing at a high level, altitude or elevation. / Of or pertaining to a person of a high social position or high rank within a hierarchy or organization. / Consisting of such people.

(chiefly Britain) An at-grade crossing between a railway line and an ordinary road, with rails and road at the same level.

relatively unimportant / not intense / (computing) of, or relating to a program, or to code in which each statement corresponds to a single machine instruction / detailed

Highest. / Best. / (Internet) Applied to domains at the highest level, such as .uk covering all sites for the United Kingdom.

(programming) read-eval-print loop

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.