<p><strong>Noun</strong></p><ul><li>one of a flight or series of steps for going from one level to another, as in a building.</li><li>stairs, such steps collectively, especially as forming a flight or a series of flights: I was so excited I ran all the way up the stairs.</li><li>a series or flight of steps; stairway: a winding stair.</li></ul><p><strong>Adjective</strong></p><ul><li>characterized by, done in, or executed with secrecy or concealment, especially for purposes of subversion or deception; private or surreptitious: Their clandestine meetings went undiscovered for two years.</li><li>Synonyms: illicit, confidential, underhand, hidden.</li></ul>