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obs. abbreviation of "obsolete," no longer in use, as a word or expression, or a type of implement or equipment. [2 definitions]
obscene offensive to accepted views of morality and decency, or to one's own sense of morality and decency. [3 definitions]
obscenity the state, condition, or crime of being obscene; indecency, lewdness, or repulsiveness. [2 definitions]
obscurantism active opposition to intellectual enlightenment, esp. by withholding knowledge from the public. [2 definitions]
obscure weakly or poorly illuminated. [6 definitions]
obscurity the state or condition of being dark or dim. [3 definitions]
obsequious showing or tending to show servile obedience or deference; fawning.
obsequy (usu. pl.) a funeral rite or ceremony.
observable able to be observed; visible. [2 definitions]
observance compliance or obedience. [4 definitions]
observant watching carefully; alert; attentive. [2 definitions]
observation the act or an instance of observing. [5 definitions]
observation car a railway car with large windows from which passengers may observe the scenery.
observation post a forward military position from which the enemy can be observed and artillery fire can be directed.
observatory a building containing equipment for making astronomical or other kinds of scientific observations.
observe to perceive; see. [10 definitions]
observer someone who observes an event such as a meeting but does not participate in it. [2 definitions]
obsess to preoccupy the mind or emotions of (someone) excessively or abnormally.
obsession that which preoccupies one's mind or emotions excessively or abnormally. [2 definitions]
obsessive of, pertaining to, characterized by, or causing an obsession.
obsessive-compulsive of or relating to having unwanted and uncontrollable thoughts (obsessions), and engaging in repetitive and uncontrollable behaviors (compulsions). [3 definitions]