Etymology
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afternoon (n.)

"part of the day from noon to evening," c. 1300, from after + noon. In 15c.-16c., the form was at afternoon; from c. 1600 it has been in the afternoon. As an adjective from 1570s. Middle English had also aftermete "afternoon, part of the day following the noon meal" (mid-14c.).

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Definitions of afternoon

afternoon (n.)
the part of the day between noon and evening;
he spent a quiet afternoon in the park
afternoon (n.)
a conventional expression of greeting or farewell;
Synonyms: good afternoon
From wordnet.princeton.edu