I. conjunction
Date: 14th century
: to the extent or degree that
is safe, as far as we know
— often used in expressions like “as far as (something) goes” and “as far as (something) is concerned” to mean “with regard to (something)”
we felt pretty safe as far as the fire was concerned — Mark Twain
or in expressions like “as far as (someone) is concerned” to mean “in (someone's) opinion”
as far as I'm concerned, it's a mistake
II. preposition
Date: 1523
: with regard to : concerning
neatly groomed and, as far as clothes, casual looking — New York Times
as far as being mentioned in the Ten Commandments, I think it is — Billy Graham
— chiefly in oral use