<p><strong>Preposition</strong></p><ul><li>from one side to the other of: a bridge across a river</li><li>on or to the other side of; beyond: across the sea</li><li>into contact with; into the presence of, usually by accident: to come across an old friend; to run across a first edition of Byron</li><li>crosswise of or transversely to the length of something; athwart: coats across the bed; straddled across the boundary line</li></ul><p><strong>Adverb</strong></p><ul><li>from one side to another</li><li>on the other side: We'll soon be across</li><li>crosswise; transversely: with arms across</li><li>so as to be understood or learned: He couldn't get the idea across to the class</li><li>into a desired or successful state: to put a business deal across</li></ul><p><strong>Adjective</strong></p><ul><li>being in a crossed or transverse position; crosswise: an across pattern of supporting beams</li></ul>