normalization

https://dx.doi.org/10.1351/goldbook.NT07086
A mathematical procedure which ensures that the integral of the square of modulus of a wave-function over all space equals 1. The constant required to ensure that a wave-function is normalized is termed the normalization constant.
Source:
PAC, 1999, 71, 1919 (Glossary of terms used in theoretical organic chemistry) on page 1956