predeterminer , determiner , & pronoun
Middle English: from Old Norse báthir
When both is used in constructions with and, the structures following ‘both’ and ‘and’ should be symmetrical. Thus, studies of zebra finches, both in the wild and in captivity is better than, for example, studies of zebra finches, both in the wild and captivity. In the second example, the symmetry of ‘in the wild’ and ‘in captivity’ has been lost. Other examples: her article is detrimental both to understanding and to peace (not her article is detrimental to both understanding and to peace).