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(), a.[Cf. F. accidentel, earlier accidental.] 1. Happening by chance, or unexpectedly; taking place not according to the usual course of things; casual; fortuitous; as, an accidental visit. 2. Nonessential; not necessary belonging; incidental; as, are accidental to a play. Accidental chords (Mus.), those which contain one or more tones foreign to their proper harmony. Accidental colors (Opt.), colors depending on the hypersensibility of the retina of the eye for complementary colors. They are purely subjective sensations of color which often result from the contemplation of actually colored bodies. Accidental point (Persp.), the point in which a right line, drawn from the eye, parallel to a given right line, cuts the perspective plane; so called to distinguish it from the principal point, or point of view, where a line drawn from the eye perpendicular to the perspective plane meets this plane. Accidental lights (Paint.), secondary lights; effects of light other than ordinary daylight, su Ac°ciden"tal (), n. 1. A property which is not essential; a nonessential; anything happening accidentally. He conceived it just that accidentals . . . should sink with the substance of the accusation. Fuller. 2. pl. (Paint.) Those fortuitous effects produced by luminous rays falling on certain objects so that some parts stand forth in abnormal brightness and other parts are cast into a deep shadow. 3. (Mus.) A sharp, flat, or natural, occurring not at the commencement of a piece of music as the signature, but before a particular note. スポンサード リンク
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