Ratability n. : The quality or state of being ratable.

Example:


Taxonomy
readability, grade level, readability formulas, reading, free encyclopedia, score, formulas, languages, measures, factors, Extensive research, reading skill, reading level, source code, typography, computer programming, interaction, design.

Defination from the web:
Readability is defined as reading ease, especially as it results from a writing style. ... Examinations of text readability provide information in comparing appropriateness of text content, both semantic and syntactic, ... ( See Typography#Readability and legibility for more details. ...