A figure of speech by which arguments, after having been considered from various points of view, are all brought to bear on one point.
Early 18th century; earliest use found in Phillips's New World of Words. From post-classical Latin diallage, denoting a figure of speech from ancient Greek διαλλαγή interchange from διαλλαγ-, aorist stem of διαλλάσσειν to interchange from δια- + ἀλλάσσειν to change, exchange.
Any of various mineral varieties (originally amphiboles and pyroxenes; in later use specifically clinopyroxenes, as diopside and augite) which display distinct pinacoidal lamination, often with other minerals between the plates.
Early 19th century; earliest use found in Robert Jameson (1774–1854), geologist and natural historian. From French diallage from ancient Greek διαλλαγή.