Edelstein Family Law Lawyer, Illinois

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.

Consensual sexual relations by a married person with someone other than his or her spouse. In many states, adultery is technically a crime, though people are rarely prosecuted for it. In states that have retained fault grounds for divorce, adultery is always sufficient grounds for a divorce. In addition, some states alter the distribution of property between divorcing spouses in cases of adultery, giving less to the 'cheating' spouse.

An agreement made by a divorcing couple regarding the division of property, custody and visitation of the children, alimony or child support. The agreement must be put in writing, signed by the parties and accepted by the court. It becomes part of the divorce decree and does away with the necessity of having a trial on the issues covered by the agreement. A divorce agreement may also be called a marital settlement agreement, marital termination agreement or settlement agreement.

In some states, a type of marriage in which couples can become legally married by living together for a long period of time, representing themselves as a married couple and intending to be married. Contrary to popular belief, the couple must intend to be married and act as though they are for a common law marriage to take effect -- merely living together for a long time won't do it.

Any divorce in which the spouse who wants to split up does not have to accuse the other of wrongdoing, but can simply state that the couple no longer gets along. Until no-fault divorce arrived in the 1970s, the only way a person could get a divorce was to prove that the other spouse was at fault for the marriage not working. No-fault divorces are usually granted for reasons such as incompatibility, irreconcilable differences, or irretrievable or irremediable breakdown of the marriage. Also, some states allow incurable insanity as a basis for a no-fault divorce. Compare fault divorce.

Any act of inflicting unnecessary emotional or physical pain. Cruelty or mental cruelty is the most frequently used fault ground for divorce because as a practical matter, courts will accept minor wrongs or disagreements as sufficient evidence of cruelty to justify the divorce.