in·ci·dence /ˈɪn(t)sədən(t)s, ˌdɛn(t)s/
 影響範圍,發生,影響,入射,傾角


 in·ci·dence /ˈɪn(t)sədən(t)s, səˌdɛn(t)s/ 名詞
 發生率,發病率


 incidence
 接合


 incidence
 關聯 入射


 In·ci·dence n.
 1. A falling on or upon; an incident; an event; an occurrence. [Obs.]
 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.
 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.

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 incidence
      n 1: the relative frequency of occurrence of something [syn: {relative
           incidence]
      2: the striking of a light beam on a surface; "he measured the
         angle of incidence of the reflected light"