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Advances in technology are often responsible for retronym coinage. For example, the term "acoustic guitar" was coined at the advent of electric guitars, and analog watches were thus named to distinguish them from digital watches.
Sometimes retronyms serve to differentiate two similarly named people, as with U.S. President George Bush, who, after his son George W. Bush was elected president in 2000, was typically referred to as "George Bush, Sr.", "George H. W. Bush", "H. W.", or "Bush 41" (as he was the 41st U.S. President).
In the entertainment industry, this can manifest itself as calling a movie "Part 1" after sequels are released or by slightly altering the title (e.g., Star Wars Episode IV: A New Hope or Indiana Jones and the Raiders of the Lost Ark) to emphasize its connection with the sequel(s), or by referring to a television series as "the original", as in Star Trek: The Original Series.
The earliest razors with encased blades were called "safety razors" to distinguish them from what were then just called "razors". But the safety razor has since become the standard and the original razor is now called a "straight-edge", "open", or "cut-throat" razor.
The first bicycles with two wheels of equal size were called "safety bicycles" because they were easier to handle than the then-dominant style that had one large wheel and one small wheel, which then became known as an "ordinary" bicycle. Since the end of the 19th century, most bicycles have been expected to have two equal sized wheels, and the other type has been renamed "penny-farthing" or "high-wheeler" bicycle.
The original use of an adjective to describe a particular variant of an object is typically compositional, as in "acoustic guitar", but gradually over time it becomes a collocation, a name or technical term in its own right with additional nuances, greater specificity, and general but implicit agreement on it as the appropriate term versus alternative descriptions of the original.
The main exceptions to this relate to ownership, such as a trademark owner adding words to an existing product name or brand to create differentiated names for new variants of a product, which thus enjoy the status of a name immediately upon release of the product range.
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