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