from
The Collaborative International Dictionary of English v.0.48
Chronogram \Chron"o*gram\, n. [Gr. ? time + ? writing,
character: cf. F. chronogramme.]
1. An inscription in which certain numeral letters, made to
appear specially conspicuous, on being added together,
express a particular date or epoch, as in the motto of a
medal struck by Gustavus Adolphus in 1632: ChrIstVs DVX;
ergo trIVMphVs. - the capitals of which give, when added
as numerals, the sum 1632.
[1913 Webster]
2. The record or inscription made by a chronograph.
[1913 Webster] Chronogrammatic