The height of type from foot to face, standardized at 0.9186 inch (2.333 centimeters).
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Printing, Lithography & Bookbinding) the overall height of printing plates and type, standardized as 0.9175 inch (Brit) and 0.9186 inch (US)
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
the standard height of printing type, measured from the foot to the face, in the U.S. 0.918 inch (2.33 cm).
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.