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any of various early forms of bronze or copper money used in ancient Rome.
Compare 2 (def 1).
Contemporary Examples

In 1981 Roger co-founded aes, which evolved into a Fortune 500 global energy company with assets of $34 billion.
Washington’s Richest Power Players Sandra McElwaine May 18, 2010

Historical Examples

The metal which is most often referred to in the Rigveda next to gold is called ayas (Latin, aes).
A History of Sanskrit Literature Arthur A. MacDonell

So far the words χαλκός and aes may be translated as bronze.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 Various

Avium vivae icones, in aes incisae & editae ab Adriano Collardo.
Extinct Birds Walter Rothschild

“aes” in the latter should be understood to mean what we would call “the coin,” and not necessarily coin of low denomination.
The Satyricon, Complete Petronius Arbiter

By the Greeks and Romans both the metal and its alloys were indifferently known as χαλκός and aes.
Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 3 Various

The Tuatha D Danann is used as a collective name for the aes sde.
Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 7 Various

The aes cut with a chisel were only in currency for a short time, and were withdrawn when the new coins were issued.
The Two First Centuries of Florentine History Pasquale Villari

In later times, pay was substituted for the aes hordearium, three times as much as that of the infantry.
Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 7 Various

The Latin name for this metal was aes Brundusinum, or “brass of Brindisi.”
Stories That Words Tell Us Elizabeth O’Neill

1. Application environment specification.
2. Advanced Encryption Standard.
Adlai E. Stevenson
advanced encryption standard