also: あふたーぬーん
Katakana loanword-style equivalent of 午後. In ordinary time expressions 午後 is more standard; アフタヌーン is especially common in stylish or commercial compounds such as アフタヌーンティー or アフタヌーンセット.
See also: 午後
We enjoyed afternoon tea in the hotel lounge.
I ordered the cafe's afternoon set.
afternoon dress
Abbreviation of アフタヌーンドレス, used in fashion-related contexts. This is not the usual everyday meaning of アフタヌーン.
See also: アフタヌーンドレス
In fashion magazines, アフタヌーン is sometimes used as an abbreviation for afternoon dress.
We enjoyed afternoon tea in the hotel lounge.