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Quad

Specified typesetting size - em-quad, en-quad - hence the old term from the pre-digital era - quadding: the addition of space between words/letters to fill out a line of type using en or em blocks.

Quadratone

A black and white image printed with four screens and four colours, such as one or more blacks and different shades of grey, used to enrich the contrast between light and dark areas.

Quarto

A piece of paper folded in half then half again, making quarters or 8 pages.

Quire

1/20th of a ream (25 sheets).