![]() But even in instances involving just two equivalent terms, other complications can render strict observance of the "comma before or" rule counterproductive. ![]() In my view, the logical argument for setting off equivalent ideas with a comma (as in "postures, or asanas") loses all force in situations involving more than two equivalent terms and no stronger ordering punctuation than commas. Of course, that reading is "new" only if the author systematically uses serial commas in lists of three or more alternatives in AP (or "no-serial-comma") style, the unintended "alternatives" reading is possible when no comma appears before the or. Although the logic of the "postures, or asanas" example seems to endorse adding a comma after kilo here, the author evidently expects readers to be sufficiently familiar with the word kilogram not to require that the word be spelled out in full-and in the absence of a possible misinterpretation of equivalent terms ("X kilograms" and "Y pounds") as mutually exclusive alternatives, the usefulness of employing the comma to signal their equivalence vanishes.īy early Tuesday he was dead – a victim of the most deadly of the world’s culinary delicacies, the blowfish or fugu.Īs Barmar notes in a comment above, adding a comma before or makes a new misreading possible: that three possible culprits ("the most deadly of the world's culinary delicacies," "blowfish," and "fugu") are under suspicion for the person's death. The writer presents readers with three equivalent measures: "just 18 ounces," "half a kilo," and "just over a pound." The dash following "ounces" stands for something like "that is" and introduces the two equivalents that follow. Joshua was born weighing just 18 ounces – half a kilo or just over a pound. The comma before or, assuming that readers understand it as a sign of equivalence rather than as a marker for incompatible alternative options, clarifies that asanas is equivalent to postures, not an alternative to it. In other words, the reader might read "Yoga is a series of postures or asanas" as including an implied "either" that introduces two incompatible alternatives, much as the sentence "The most feared wild animals in the Sierra Nevada were grizzly bears or cougars" does. Is that a reader who doesn't know what an asana is might otherwise suppose that the term refers to some sort of alternative to a posture (rather than being another way of saying posture). The logical argument for adding a comma before or in the sentence
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