<p><strong>Noun</strong></p><ul><li>a flat or level surface.</li><li>a surface generated by a straight line moving at a constant velocity with respect to a fixed point.</li><li>an area of a two-dimensional surface having determinate extension and spatial direction or position: oblique plane; horizontal plane.</li><li>a level of dignity, character, existence, development, or the like: a high moral plane.</li><li>Synonyms: stage, stratum.</li><li>an airplane or a hydroplane: to take a plane to Dallas.</li><li>a thin, flat or curved, extended section of an airplane or a hydroplane, affording a supporting surface.</li><li>a longitudinal section through the axis of a column.</li></ul><p><strong>Adjective</strong></p><ul><li>flat or level, as a surface.</li><li>Synonyms: flush, even, smooth.</li><li>of or relating to planes or plane figures.</li></ul><p><strong>Verb</strong></p><ul><li>to glide or soar.</li><li>(of a boat) to rise partly out of the water when moving at high speed.</li><li>Informal: to fly or travel in an airplane: We'll drive to Detroit and plane to Los Angeles.</li></ul>