Subordinate; secondary; auxiliary.
Something that serves an ancillary function, such as an easel for a painter.
Dependent upon, or appertaining to, another thing, called the principal.
Liable to happen; apt to occur; befalling; hence, naturally happening or appertaining.
Arising as the result of an event, inherent.
Coming or happening accidentally; not in the usual course of things; not in connection with the main design; not according to expectation; casual; fortuitous.
Falling on or striking a surface.
An event that causes or may cause an interruption or a crisis, such as a workplace illness or a software error.
A (relatively minor) event that is incidental to, or related to others.
An event or occurrence.