What is a meta-director?
I assume this question was asked on the basis of aromatic chemistry.
When benzene is substituted by a meta-director,
The classic meta-director is the nitro group, which contains a quaternized nitrogen centre,
On the other hand, the meta positions (
All of what I have written here accounts for the experimental observation that meta substitution of substituted arenes is more favourable, when the initial substituent is a deactivating group (and a meta director). In other words we try to account for the experimental result.