a conventional expression of greeting or farewell
"I'll see you tomorrow afternoon!"
The part of the day from noon or lunchtime until sunset, evening, or suppertime or 6pm.
"We decided to meet for coffee in the afternoon since it was too early for dinner but past our usual work hours."
In plain English: Afternoon is the time of day between noon and evening.
"We usually have our longest meetings in the afternoon."
Usage: Use "afternoon" to refer specifically to the time period beginning at noon and ending in the late afternoon or early evening. It denotes the interval between lunchtime and the start of supper rather than any arbitrary hour of the day.
In the afternoon.
"I usually take a walk during the afternoon to clear my head before dinner."
"We decided to meet in the afternoon."
Usage: Afternoon" is primarily a noun referring to the time between noon and evening, not an adverb. You should use it as a noun in phrases like "in the afternoon" or simply state the time period directly rather than trying to modify a verb with the word itself."
Ellipsis of good afternoon.
"Oh, hello! Good afternoon." she said when I walked into the store.""
The word afternoon comes from Middle English and originally meant the time after noon. It traveled into modern usage by simply combining the words "after" and "noon."