Angle of incidence, the angle which a ray of light, or the line of incidence of a body, falling on any surface, makes with a perpendicular to that surface; also formerly, the complement of this angle.Line of incidence, the line in the direction of which a surface is struck by a body, ray of light, and the like.

(In"ci*den*cy) n. Incidence. [Obs.] Shak.

(In"ci*dent) a. [L. incidens, -entis, p. pr. & of incidere to fall into or upon; pref. in- in, on + cadere to fall: cf. F. incident. See Cadence.]

1. Falling or striking upon, as a ray of light upon a reflecting surface.

2. Coming or happening accidentally; not in the usual course of things; not in connection with the main design; not according to expectation; casual; fortuitous.

As the ordinary course of common affairs is disposed of by general laws, so likewise men's rarer incident necessities and utilities should be with special equity considered.

3. Liable to happen; apt to occur; befalling; hence, naturally happening or appertaining.

All chances incident to man's frail life.

The studies incident to his profession.

4. (Law) Dependent upon, or appertaining to, another thing, called the principal.

Incident proposition(Logic), a proposition subordinate to another, and introduced by who, which, whose, whom, etc.; as, Julius, whose surname was Cæsar, overcame Pompey. I. Watts.

(In"ci*dent), n. [Cf. F. incident.]

1. That which falls out or takes place; an event; casualty; occurrence.

2. That which happens aside from the main design; an accidental or subordinate action or event.

No person, no incident, in a play but must be of use to carry on the main design.

3. (Law) Something appertaining to, passing with, or depending on, another, called the principal. Tomlins.

Syn. — Circumstance; event; fact; adventure; contingency; chance; accident; casualty. See Event.

(In`ci*den"tal) a. Happening, as an occasional event, without regularity; coming without design; casual; accidental; hence, not of prime concern; subordinate; collateral; as, an incidental conversation; an incidental occurrence; incidental expenses.

By some, religious duties . . . appear to be regarded . . . as an incidental business.

Syn. — Accidental; casual; fortuitous; contingent; chance; collateral. See Accidental.

In`ci*den"tal*ly, adv.In`ci*den"tal*ness, n.

I treat either or incidentally of colors.

1. A falling on or upon; an incident; an event. [Obs.] Bp. Hall.

2. (Physics) The direction in which a body, or a ray of light or heat, falls on any surface.

In equal incidences there is a considerable inequality of refractions.
Sir I. Newton.

  By PanEris using Melati.

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