(1) A solid or patterned line of any weight (line width) that extends horizontally across a row or page, or vertically down a column or page.
(2) A set of conditional statements that enable computer systems to identify relationships and execute automated responses accordingly.
(3) A condition that must be satisfied when performing a business activity.
(4) A list of conditions and actions that are triggered when certain conditions are met. Conditions include attributes about an object (file name, type or extension, dates, owner, and groups), the requesting client, and the container name associated with the object. See also file-placement rule.