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second self a person who is so closely involved with another as to take on many of the other's personal qualities, values, and the like.
second sight the alleged ability to witness faraway events and foresee the future; clairvoyance.
second-source of or denoting a cooperative business arrangement in which products of one company are also manufactured by another company. [2 definitions]
second-string of or designating a player or team that is kept ready to substitute for any primary player or players in an athletic contest. [2 definitions]
second thought (often pl.) a reconsideration of, or doubt about, a previous decision or opinion.
second wind the return of comparative ease in breathing, following a brief period of exhaustion, that often occurs during a physically demanding activity such as running. [2 definitions]
secrecy the state or condition of being secret. [2 definitions]
secret concealed from others; private. [8 definitions]
secret agent a person who performs acts of espionage and other undercover operations, esp. for a government.
secretarial of or relating to the work of a secretary.
secretariat the department of a government, organization, or the like that is entrusted with administration, record keeping, and secretarial work, or the employees of such a department. [2 definitions]
secretary a person who works for a business, an institution, or an individual at such administrative tasks as managing correspondence, keeping records, and scheduling meetings and appointments. [4 definitions]
secretary bird a large black and gray-blue African bird of prey with a long neck, long legs, and a crest of long feathers that resemble quills.
secretary-general the chief executive of a secretariat.
secretary of state (cap.) the person who heads the U.S. Department of State. [4 definitions]
secrete1 to generate or separate (a fluid or other substance) from an organism's cells or fluids and then release (it) into the organism's system.
secrete2 to hide or conceal.
secretin a hormone secreted by the small intestine that stimulates the production of pancreatic juice and bile as part of the digestive process.
secretion the act or process, in a cell or gland, of separating or generating a fluid or other substance from body cells or fluids and then releasing it into the body's system. [2 definitions]
secretive tending to secrecy.
secretly in a secret manner, so as to conceal the action from others involved. [2 definitions]