| NOUN | shape | angle of incidence, incidence angle | the angle that a line makes with a line perpendicular to the surface at the point of incidence |
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| Meaning | The angle that a line makes with a line perpendicular to the surface at the point of incidence. | |
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| Synonym | incidence angle | |
| Narrower | angle of attack | The acute angle between the direction of the undisturbed relative wind and the chord of an airfoil |
| critical angle | The smallest angle of incidence for which light is totally reflected | |
| Broader | angle | The space between two lines or planes that intersect |
| Spanish | ángulo de incidencia | |
| Catalan | angle d'incidència | |
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