noun
EXAMPLES FROM CORPUS
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The files contained a single document, his lob application, filled out in block letters and unsigned.
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The lines, mainly in block letters , wander and slant across the page.
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The surname should be written or typed in block letters followed by the title of the guest, and then the initials.
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This is what it says, high above a doorway, in big block letters , at Pasadena's Clearwater Seafood.