say

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say

Archaic a type of fine woollen fabric
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

say

A human may "say" things to a computer by typing them on a terminal. "To list a directory verbosely, say "ls -l"." Tends to imply a newline-terminated command (a "sentence").

A computer may "say" things to you, even if it doesn't have a speech synthesiser, by displaying them on a terminal in response to your commands. This usage often confuses mundanes.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)