Maybe too simple for us Renaissance-type folk (not a hint, just meant to suggest that among us we know everything), but here goes:

SERAC

Send your daffynitions by PM.

Entries will be taken until some unspecified time next week, so take your time; be grandiose and expansive... (again, not a hint, just an invitation)

mine is off to you via PM

...off to a good start. In addition to Jo's I have entries from Arnie, Jerry Thomas, and Kalleh. Plus the real one...

Not at Critical Mass yet, though. Put your Thinking Caps on, all, and set your fingers to the keyboard!

...need just a couple more and we'll be ready to roll...