Englishfor English speakers
an
Determinative
—
An (or a) is used when the following word could be any of a certain type.
I just ate an apple.
It is indeed an honor to have met you today.
der
interjection
—
(Australian) Disdainful indication that something is obvious.
—
(Australian) Indication of stupidity.
via
Preposition
—
You use via to mean the path that something takes when it goes somewhere (the places it goes through before it gets there).
We can send video, audio and data from any point in the UK, via satellite.
This became part of our route from Liverpool to Manchester via Runcorn.
John sent the message to Yoko via Hamid.