<p><strong>Noun:</strong></p><ul><li>A person employed by a government to obtain secret information or intelligence about another, usually hostile, country, especially with reference to military or naval affairs.</li><li>A person who keeps close and secret watch on the actions and words of another or others.</li><li>A person who seeks to obtain confidential information about the activities, plans, methods, etc., of an organization or person, especially one who is employed for this purpose by a competitor: an industrial spy.</li><li>The act of spying.</li></ul><p><strong>Verb (used without object):</strong></p><ul><li>To observe secretively or furtively with hostile intent (often followed by on or upon).</li><li>To act as a spy; engage in espionage.</li><li>To be on the lookout; keep watch.</li><li>To search for or examine something closely or carefully.</li></ul><p><strong>Verb (used with object):</strong></p><ul><li>To catch sight of suddenly; espy; descry: to spy a rare bird overhead.</li><li>To discover or find out by observation or scrutiny (often followed by out).</li><li>To observe (a person, place, enemy, etc.) secretively or furtively with hostile intent.</li><li>To inspect or examine or to search or look for closely or carefully.</li></ul><p><strong>End of Response</strong></p>