Dimout is a term used to refer to the partial or temporary reduction in light or illumination. However, there are several synonyms that can be used in place of dimout. One of these synonyms is "partial blackout." This refers to a situation where there is a reduction in light, but not a complete one. Another synonym is "dusk," which refers to the time of day when the light starts to dim. Other synonyms include "obscuration" and "shadiness." These terms are commonly used in situations where there is an intentional or unintentional reduction in light, such as in military operations or during a power outage.