An anachronism (from the Greek ἀνά ana, 'against' and χρόνος khronos, 'time') is a chronological inconsistency in some arrangement, especially a juxtaposition of people, events, objects, language terms and customs from different time periods.
The most common type of anachronism is an object misplaced in time, but it may be a verbal expression, a technology, a philosophical idea, a musical style, a material, a plant or animal, a custom, or anything else associated with a particular period that is placed outside its proper temporal domain.
This may be an object, idiomatic expression, technology, philosophical idea, musical style, material, custom, or anything else so closely bound to a particular time period as to seem strange when encountered in a later era.
A prochronism may be an object not yet developed, a verbal expression that had not yet been coined, a philosophy not yet formulated, a breed of animal not yet evolved or bred, or use of a technology that had not yet been created.
Works of art and literature promoting a political, nationalist or revolutionary cause may use anachronism to depict an institution or custom as being more ancient than it actually is, or otherwise intentionally blur the distinctions between past and present.
For example, the 19th-century Romanian painter Constantin Lecca depicts the peace agreement between Ioan Bogdan Voievod and Radu Voievod—two leaders in Romania's 16th-century history—with the flags of Moldavia (blue-red) and of Wallachia (yellow-blue) seen in the background.
[7] Sir Walter Scott justified the use of anachronism in historical literature: "It is necessary, for exciting interest of any kind, that the subject assumed should be, as it were, translated into the manners as well as the language of the age we live in.
"[8] However, as fashions, conventions and technologies move on, such attempts to use anachronisms to engage an audience may have quite the reverse effect, as the details in question are increasingly recognized as belonging neither to the historical era being represented, nor to the present, but to the intervening period in which the artwork was created.
Where even the most obvious and superficial distinctions between one century (or millennium) and another were ignored, the profounder differences of temper and mental climate were naturally not dreamed of.... [In Chaucer's Troilus and Criseyde], [t]he manners, the fighting, the religious services, the very traffic-regulations of his Trojans, are fourteenth-century.
One example is the attribution of historically inaccurate beards to various medieval tomb effigies and figures in stained glass in records made by English antiquaries of the late 16th and early 17th centuries.
[23] In historical writing, the most common type of anachronism is the adoption of the political, social or cultural concerns and assumptions of one era to interpret or evaluate the events and actions of another.
[24] Arthur Marwick has argued that "a grasp of the fact that past societies are very different from our own, and ... very difficult to get to know" is an essential and fundamental skill of the professional historian; and that "anachronism is still one of the most obvious faults when the unqualified (those expert in other disciplines, perhaps) attempt to do history".
Anthony Grafton discusses, for example, the work of the 3rd-century philosopher Porphyry, of Isaac Casaubon (1559–1614), and of Richard Reitzenstein (1861–1931), all of whom succeeded in exposing literary forgeries and plagiarisms, such as those included in the "Hermetic Corpus", through – among other techniques – the recognition of anachronisms.
The philosopher and reformer Jeremy Bentham wrote at the beginning of the 19th century: The falsehood of a writing will often be detected, by its making direct mention of, or allusions more or less indirect to, some fact posterior to the date which it bears.