The term "post meridian" refers to the time period from noon until midnight. However, there are a number of synonyms that can be used to describe this particular time of day. Some common alternatives include "afternoon", "evening", "nighttime", "dusk", "twilight", and "nightfall". These words are all useful for describing the hours after noon, whether you're planning an evening outing, settling in for the night, or simply looking for a way to describe the transition from day to night. Regardless of which synonym you choose, it's important to remember that post meridian is a valuable term that is widely used in a variety of settings.