double eagle noun3 •Three under par, one stroke short of an ace (a hole in one) on a par-five hole. •A representation of an eagle with two heads, as in the heraldic arms of Russia and Austria and in iconography from Antiquity onward (especially in the Roman Empire).The black imperial double eagle is better known and still features on the Albanian national flag. — 2011 •(US) A gold coin with a face value of $20 formerly used in the United States, the double of the US eagle coin. formsdouble eagles · double-eagles