Crossword puzzle clue "something famously impossible to define"

Here are the possible solutions for something famously impossible to define clue

Answer
Clue
Relevancy
art
Clue
Something famously impossible to define
Definition
works of creative imagination
acres
Clue
They help define a lot
Definition
ACRE, a measure of land equivalent to 4840 square yards
arcs
Clue
Chords define them
Definition
ARC, to make an electric discharge
bac
Clue
It's used to define DWI
Definition
(short for) baccalaureate, a university degree
camerondiaz
Clue
"Charlie's Angels" star who helped define "tree" on "Sesame Street" in 2009: 2 wds.
elusive
Clue
Hard to define
Definition
tending to elude
eras
Clue
Presidencies may define them
Definition
ERA, a main division of geological time
kimcattrall
Clue
"Sex and the City" star who helped define "fabulous" on "Sesame Street" in 2008: 2 wds.

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