## Wikipedia - Alfabeto greco (it) Wikipedia - Lunghezza d'onda (it) wavelength, $$\lambda$$

https://doi.org/10.1351/goldbook.W06659
Distance in the direction of @P04881@ of a periodic wave between two successive points where at a given time the phase is the same.
Sources:
Green Book, 2nd ed., p. 30 [Terms] [Book]
ISO 31-05: 1992 [Terms] [Book]
PAC, 1996, 68, 957. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 998 [Terms] [Paper]