latin: argumentum= argument, proof, (distinctive) mark
...... arguere= to enlighten, explain, prove
greek: argos= clear, shining white
indoeuropean: argy- : light, clear, shining
The arguments constitute a functions interface,its signature, it's "distinctive mark" -- somewhat like the "eyes" of the god Argos ("the clear eyed") in greek mythology, a herdsman whose eyes were always open && saw everything.
-- Allan Dystrup
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As the eternal tranquility of Truth reveals itself to us, this very place is the Land of Lotuses -- Hakuin Ekaku Zenji