n. A space beneath the main design on a coin for the insertion of the date.
the GNU version of the Collaborative International Dictionary of English
n. The small space beneath the base line of a subject engraved on a coin or medal. It usually contains the date, place, engraver's name, etc., or other subsidiary matter.
The Century Dictionary and Cyclopedia
n. In numismatics, that part of the reverse of a coin or medal which is below the main device (“type”), and distinctly separated from it, generally by a line.
Word Usage
"Salem, Massachusetts, in 1692. 75. 33. exergues: the exergue is a term in numismatics to signify the space under the principal figure on the reverse of a coin, usually containing the date or place of coining."