a person who abates a nuisance
a person who, without right, enters into a freehold on the death of the last possessor, before the heir or devisee
one who abates, ends, or does away with a nuisance
This word comes from Anglo-Norman, combining abate (meaning to enter a property without right after an owner's death) with the suffix -or. Originally, it referred to someone who took possession of land before the rightful heir arrived.