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Adverse: Adverse or adverse interest, in law, is anything that functions contrary to a party's interest. This word should not be confused with averse.
Adverse possession: Adverse possession, sometimes colloquially described as "squatter's rights", is a legal principle under which a person who does not have legal title to a piece of property—usually land —acquires legal ownership based on continuous possession or occupation of the land without the permission of its legal owner.In general, a property owner has the right to recover possession of their property from unauthorised possessors through legal action such as ejectment. However, in the English common law tradition, courts have long ruled that when someone occupies a piece of property without permission and the property's owner does not exercise their right to recover their property for a significant period of time, not only is the original owner prevented from exercising their right to exclude, but an entirely new title to the property "springs up" in the adverse possessor.
Adverse selection: In economics, insurance, and risk management, adverse selection is a market situation where buyers and sellers have different information, so that a participant might participate selectively in trades which benefit them the most, at the expense of the other trader. A textbook example is Akerlof's market for lemons.
Adverse effect: An adverse effect is an undesired harmful effect resulting from a medication or other intervention such as surgery. An adverse effect may be termed a "side effect", when judged to be secondary to a main or therapeutic effect.