mid-15c. ternishen, "become tarnished; discolor," from Old French terniss-, present-participle stem of ternir "dull the luster or brightness of, make dim" (15c.), probably from terne (adj.) "dull, dark," which according to Diez is from a Germanic source cognate with Old High German tarnjan "to conceal, hide," Old English dyrnan "to hide, darken," from Proto-Germanic *darnjaz (see dern), but there are difficulties of form, sense, and date. Figurative sense is from 1690s. Related: Tarnished; tarnishing.
Atomic energy is recorded by 1906 in the modern sense (as intra-atomic energy from 1903).
March, 1903, was an historic date for chemistry. It is, also, as we shall show, a date to which, in all probability, the men of the future will often refer as the veritable beginning of the larger powers and energies that they will control. It was in March, 1903, that Curie and Laborde announced the heat-emitting power of radium. [Robert Kennedy Duncan, "The New Knowledge," 1906]
Atomic bomb is first recorded 1914 in writings of H.G. Wells ("The World Set Free"), who thought of it as a bomb "that would continue to explode indefinitely."
When you can drop just one atomic bomb and wipe out Paris or Berlin, war will have become monstrous and impossible. [S. Strunsky, Yale Review, January 1917]
Atomic Age is from 1945. Atomic clock is from 1938. Atomical "concerned with atoms," also "very minute," is from 1640s.
1580s (n.); 1590s (adj.), in reference to Roman leap year, from Late Latin (annus) bisextilis "leap year," more literally "the twice sixth-day, (a year) containing a second sixth (day)." To keep the Julian calendar consistent with the sun, the sixth day (by inclusive reckoning) before the Calends of March was doubled every four years. The date corresponds to our February 24th. From Latin bissextus/bisextis (dies), from bis "twice" (see bis-) + sextus "sixth (day before the First of March)," from sex "six" (see six).
type of tropical shrub or tree that grows abundantly in tidal mud with large masses of interlacing roots above ground, 1610s, mangrow, probably from Spanish mangle, mangue (1530s), which is perhaps from a word in Carib or Arawakan, native languages of the West Indies. The modern spelling in English (1690s) is from influence of grove. A Malay (Austronesian) origin also has been proposed for the word, but it is difficult to explain how that would come to be used at that date for the American plant.
late 14c., "power, efficacy," from Medieval Latin actualitatem (nominative actualitas), from Late Latin actualis "pertaining to action," from Latin actus "a doing" (from PIE root *ag- "to drive, draw out or forth, move"). A Latin loan-translation of Greek energeia "activity, action, operation" (see energy). Meaning "state of being real" is from 1670s (actualities "existing conditions" is from 1660s).
Mod. use of actuality in the sense of realism, contact with the contemporary, is due to Fr. actualité, from actuel, which does not mean actual, real, but now existing, up to date. [Weekley]