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Secret cooperation between two people in order to fool another. Collusion was often practiced by couples before no-fault divorce in order to make up a grounds for divorce (such as adultery). By fabricating a permitted reason for divorce, colluding couples hoped to trick a judge into granting their freedom from the marriage. But a spouse accused of wrongdoing who later changed his or her mind about the divorce could expose the collusion to prevent the divorce from going through.

A divorce obtained in a different state or country from the place where one spouse resides at the time of the divorce. As a general rule, foreign divorces are recognized as valid if the spouse requesting the divorce became a resident of the state or country granting the divorce, and if both parties consented to the jurisdiction of the foreign court. A foreign divorce obtained by one person without the consent of the other is normally not valid, unless the nonconsenting spouse later acts as if the foreign divorce were valid, for example, by remarrying.

The inability of a spouse to engage in sexual intercourse with the other spouse. In some states, physical incapacity is a ground for an annulment or fault divorce, assuming the incapacity was not disclosed to the other spouse before the marriage.

Latin for 'friend of the court.' This term describes a person or organization that is not a party to a lawsuit as plaintiff or defendant but that has a strong interest in the case and wants to get its two cents in. For example, the ACLU often submits materials to support a person who claims a violation of civil rights even though that person is represented by a lawyer.

The legal union of two people. Once a couple is married, their rights and responsibilities toward one another concerning property and support are defined by the laws of the state in which they live. A marriage can only be terminated by a court granting a divorce or annulment. Compare common law marriage.

A child placed by a government agency or a court in the care of someone other than his or her natural parents. Foster children may be removed from their family home because of parental abuse or neglect. Occasionally, parents voluntarily place their children in foster care. See foster care.

A type of Social Security benefit available to spouses and minor or disabled children of retired or disabled workers who qualify for either retirement or disability benefits under the program's rigorous qualification guidelines.