The definition of anent is about.(preposition)
An example of anent is letting someone know which topic you're referencing in a letter; talking anent is talking about.
See anent in Webster's New World College Dictionary
Origin: ME anent (with unhistoric -t) < OE onemn, on efen, lit., on even (with), level (with)
See anent in American Heritage Dictionary 4
Origin: Middle English
Origin: , from Old English onefn, near
Origin: : on, on; see on
Origin: + efn, even.