I.R.I.S. Readiris 14 for Mac User Guide - Manual (Page 63)

Section 5: Selecting the Recognition Options
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every time. Therefore, it is useful to use font dictionaries. Font
dictionaries contain font information learned during interactive
learning and can substantially increase the recognition results.
Note that font dictionaries are limited to 500 shapes. You are
recommended to create separate dictionaries for specific
applications.
To create a new font dictionary:
 On the Learn menu click the command New Dictionary.
 Click Interactive Learning on the Learn menu to activate it.
 Click Save to process the document.
 Readiris enters the interactive learning phase. Use the buttons of
the dialog box to save characters in the font dictionary and save
the document when the recognition is finished.
 Then return to the Learn menu and click Save Dictionary to
save it.
 Enter the name of the dictionary and click Save.
To use an existing font dictionary:
 On the Learn menu click Open Dictionary.
 Select the dictionary you want to use and click Open.