Definition -
(1) A short and pithy sentence (e.g. I came, I saw, I conquered).
(2) Habitual terseness of speech.

Etymology -
The word derives from the Greek laconismos, imitation of the people of Laconia. The latter derives from the Greek Lakon, person from Lakonia, which was the district around Sparta in southern Greece — the inhabitants were famous for their terse speech.

Oxford English Dictionary -
Its first citation in sense (1) is from 1682:
"The hand of Providence writes often by abbreviatures … which like the Laconism on the wall, are not to be made out but by a hint or key."
(Sir T. Browne Chr. Mor. (1756) 35)

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