I've encountered a contradiction in different dictionaries regarding the definition of acreage.
Oxford Dictionary says
An area of land, typically when used for agricultural purposes, but not necessarily measured in acres.
Cambridge Dictionary and a few others say
An area of land measured in acres.
the area of a piece of land measured in acres.
I usually use the Oxford Dictionary as a reference work, but I am not sure this time. Is there a way to tell which one is correct?