Evening in its primary meaning is the period of the day between afternoon and night. Though the term is subjective, evening is typically understood to begin 30 minutes to six hours before sunset, when temperatures begin to fall, and lasts until just after nightfall, when complete darkness has been reached. In layman's terms, the evening can range anywhere from four o'clock to nine.
In the vernacular of at least parts of the rural Southern United States (notably Appalachia) and in some British dialects, "evening" /ˈiːvnɪn/ is used to mean "afternoon", as the main meal of the day, dinner, traditionally has occurred at midday. While the exact meaning of the word in this sense is subject to interpretation, "evening" in the South usually has been thought of as beginning at about noon and extending roughly until sunset or suppertime.