Since I adequately defined "symbol formation", what's left to define
about "explanation"?
Given "information", "formation", and "symbol":
Explaining: Presenting the information used in the formation of a
symbol.
Definition: The information contained by a symbol.
Non-circular, unless you'd care to challenge "presenting", "used", or
"contained"? Maybe "presenting", but I can define that as the encoding
of the information as linguistic speech, the pronunciation of that
speech, and the decoding of that speech by the recipient. Trivial.
--
sentience@pobox.com Eliezer S. Yudkowsky
http://tezcat.com/~eliezer/singularity.html
http://tezcat.com/~eliezer/algernon.html
Disclaimer: Unless otherwise specified, I'm not telling you
everything I think I know.