adj. Falling or striking upon, as a ray of light upon a reflecting surface.adj. Coming or happening accidentally; not in the usual course of things; not in connection with the main design; not according to expectation; casual; fortuitous.adj. Liable to happen; apt to occur; befalling; hence, naturally happening or appertaining.adj. Dependent upon, or appertaining to, another thing, called the principal.n. That which falls out or takes place; an event; casualty; occurrence.n. That which happens aside from the main design; an accidental or subordinate action or event.n. Something appertaining to, passing with, or depending on, another, called the principal.