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1. The narrowest of the metal spaces used for separating words or letters.
2. A similar narrow space used in formatting text.
(Printing, Lithography & Bookbinding) printing the thinnest of the metal spaces used in setting type to separate letters or words
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|Noun||1.||hair space - (printing) the narrowest of the spaces used to separate words or letters|
quad, space - (printing) a block of type without a raised letter; used for spacing between words or sentences