Compound preposition
A preposition, only more tedious, and therefore beloved of our old friend the mediocre attorney.
We know that our legal brethren delight in perverting the ordinary use of words - nominalising verbs into nouns, and so on, and the compound preposition is a neat way of co-opting nouns, conjunctions — all kinds — into the servile business of putting one noun in relation to another.
Why, for example, exercise your rights under a contract when you can do so in accordance with or pursuant to it?
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