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Related to afternoon: late afternoon

good day

A conventional, formal, and somewhat old-fashioned expression of greeting or farewell used during the daytime. Good day, sir! What news do you have for me from our partners out east? I will not tolerate this sort of rudeness! I bid you good day!
See also: good

of a morning/afternoon/evening

1. Very often at this time of day; on most occasions at this time of day. My father has a ritual of an evening, enjoying the newspaper with a measure of whiskey after dinner in front of the fire.
2. At some point at this time of day. There's a soccer club playing at the park if you're ever stuck for something to do of a morning in the summertime.

(Good) afternoon.

1. the appropriate greeting for use between noon and supper time. Sally: How are you today? Jane: Good afternoon. How are you? Sally: Fine, thank you. Bob: Afternoon. Nice to see you. Bill: Good afternoon. How are you? Bob: Fine, thanks.
2. an expression used on departure or for dismissal between noon and supper time. (Meaning "I wish you a good afternoon.") Sally: See you later, Bill. Bill: Afternoon. See you later. Mary: Nice to see you. Tom: Good afternoon. Take care.

good day

Also, good afternoon or evening or morning . Formal ways of saying "Hello" or "Goodbye." For example, He began rather oddly by addressing the audience with " Good day," or " Good afternoon, ladies," said the sales clerk as we walked out. All these greetings represent an abbreviation of the now obsolete God give you a good day (afternoon, etc.), which dates from about 1200. Also see good night.
See also: good
References in classic literature ?
One beautiful November afternoon, in his Junior year, at the sound of the last bell, which usually found him cantering out of town, he went instead to the school reading-room, and, sitting down calmly, opened his book and slowly read.
Excited by her pleasant afternoon, she clapped her hands.
Three was the afternoon skimming-hour; and, with the stroke, Clare heard the creaking of the floor-boards above, and then the touch of a descending foot on the stairs.
Often already, during the fortnight that he had passed under her roof, when she enquired how he meant to spend his afternoon, he had answered paradoxically: "Oh, I think for a change I'll just save it instead of spending it--" and once, when she and May had had to go on a long-postponed round of afternoon calls, he had confessed to having lain all the afternoon under a rock on the beach below the house.
The raw afternoon is rawest, and the dense fog is densest, and the muddy streets are muddiest near that leaden-headed old obstruction, appropriate ornament for the threshold of a leaden-headed old corporation, Temple Bar.
She looked very nice now in a large straw hat: it was hot that afternoon, the hottest day they had had, and beads of sweat stood in a line on her upper lip.
Every afternoon, as they were coming from school, the children used to go and play in the Giant's garden.
The young man shut the door with a sharper slam than any visitor had used that afternoon, and walked up the street at a great pace, cutting the air with his walking-stick.
asked Philippa, popping into Anne's room one Saturday afternoon.
I called there the other day and saw an old chap who questioned and cross-questioned me until I wasn't sure whether I was on my head or my heels, and, after all, he told me to call again this afternoon for her address.
I think it would be a good idea to put all the gangs at work close to the house this afternoon," she announced one day at breakfast.
In the course of the first week, in one afternoon, he and Joe accounted for the two hundred white shirts.
A Dog looking out for its afternoon nap jumped into the Manger of an Ox and lay there cosily upon the straw.
Can I ever forget the afternoon I met "Old Scratch," Nelson's father?
For reasons best known to herself, Marilla did not tell Anne that she was to stay at Green Gables until the next afternoon.