present participle of level off

plural of T Level

(UK, education) A two-year technical course taken after GCSEs and equivalent to three A levels, developed to meet the needs of industry.

(aviation) The lowest flight level above the transition altitude; depends on the transition altitude and the measured or calculated sea-level atmospheric pressure. The flight level at which a descending aircraft's barometric altimeters are reset from a constant setting of 1013.25 hectopascals to the setting corresponding to the actual measured or calculated atmospheric pressure at mean sea level.

plural of transition level

plural of S level

(UK, historical, education) A public examination taken by the most able A-level students and typically used to support university applications, particularly to Oxbridge.

Ground level.

plural of T level

Synonym of superficial.