regular reflection

If the reflecting surface is very smooth, the reflection of light that occurs is called specular or regular reflection.

Clergymen, counseling regular reflection to balance the frenetic lives of their parishioners, often suggest a return to the "daybooks" of earlier times.

The discovery that Vietnamese was a Mon-Khmer language, and that its tones were a regular reflection of non-tonal features in the rest of the family, is considered a milestone in the development of historical linguistics.