Erudite Fluther vocabularians, if to ”decimate” is to reduce by one tenth, then what is the commensurate word for reducing by one quarter?

I am looking for the word with the same feel as “decimate”, not just “reduce by one quarter”.

And I know that “decimate” has somewhat deviated from the original Latin root and now is much more generalized, but for the purposes of this Q I am looking for specifics.