What does codec stand for? Does codec stand for compression or decompression?

I have also heard it stands for encoder/decoder.

Which is it?  Maybe something entirely different.

I'm looking for a source better then Wikipedia.
One of the earliest articles in the IEEE database that uses the term, defines it as "coders and decoders."

However, newer material does not seem to be consistent. One of the Wikipedia page's sources (at the time a page author retrieved it) alludes to both encoder-decoder and compression-decompression. This book defines it as compression/decompression.