Prefixes indicate…
Location, time, number
Ec- / ecto-
Out; outside
End/o
in; within
Mes/o
Middle
Dextr/o
Right
Ab-
Away from
Ad-
Toward; near
Dia-
through; complete
Per-
Through
Trans-
Through; across
Ante-
Before; forward
Pre-
before, in front of
Pro-
Before, in front of
Post-
After, behind
Mon/o
One; single
Bi-
Two, twice
Tri-
Three
Quadri-
Four
Poly-
Many, much