objection(The act of a party who objects to some matter or proceeding in the course of a trial or an argument or reason urged by him in support of his contention that the matter or proceeding objected to is improper or illegal)
obligation to label(The legal responsibility or duty compelling manufacturers to affix certain marks or other written identification to their products, as is directed by laws, regulations or government standards)
observation satellite(Man-made device that orbits the earth, receiving, processing and transmitting signals and generating images such as weather pictures)
occupational disease(A functional or organic disease caused by factors arising from the operations or materials of an individual's industry, trade, or occupation)