Thank you, Sue!
And Kevin, absolutely right sir: my interest is as regards paperweights.
Faceting is one technique I had not thought to include, partly because I am
fairly familiar with the definition and partly because I hadn't given much
consideration to how it's done. "Slice off sections of glass," would
have been my (
considered, technical 
) answer.
So when a paperweight is described as "faceted", it's clear to me.
But I find that sellers seem to fling the other terms around fairly freely.
Thanks to your kind replies I feel more confident in knowing
what technique I am looking at.
You'll sometimes read of a glass artist having trained as, or being an
expert in, engraving. Colin Terris, for instance. Does that then mean that
he could do a weight like a Barry Sautner or Lubomir Richter? Or does it mean
that he was trained in engraving numbers, names etc? Or both?
Ah, this is how it is. One question leads to a dozen more and those
dozen to a hundred...
Will try to keep future posts more succinct. Thanks again! Andrea