Re: Help with grammatical term

Some languages mark comitativeness with a derivation rather
than a case inflection or adposition (or optionally with a derivation
or an adposition either one); in Greek the preposition "syn"
can be used as a prefix to derive verbs meaning "to do X along with
someone", or nouns meaning "someone who does X in company
with someone", "co-~-er".   The Esperanto preposition "kun"
is used in the same way, though it doesn't undergo sandhi
of course as  prefixive "syn-" does (at least not phonemic sandhi;
maybe allophonic sandhi before a velar).

--
Jim Henry
http://www.pobox.com/~jimhenry/