Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Fixation Duration(also: Fixation Time, Gaze Duration)
- The length of time the eye remains relatively still on a specific point in a visual display during reading or visual processing. In eye-tracking research, fixation duration is a key metric for measuring cognitive processing load and readability — shorter fixations are associated…
- Flesch Reading Ease(also: Flesch Readability Score, Flesch Score, FRE)
- A readability formula developed by Rudolf Flesch in 1948 that rates text on a 100-point scale based on average sentence length and average number of syllables per word. Higher scores indicate easier-to-read text: scores of 60-70 are considered suitable for a general audience,…
- Flesch-Kincaid Grade Level(also: Flesch-Kincaid, FKGL, Flesch-Kincaid readability)
- A readability formula that estimates the U.S. school grade level required to comfortably read a given English text, based on average sentence length and average syllables per word. Developed for the U.S. Navy in 1975 by Rudolf Flesch and J. Peter Kincaid, the formula is widely…
- Fluency(also: Text fluency, Grammatical fluency)
- In natural language processing and text simplification, fluency is the degree to which a piece of text is grammatically correct and reads naturally in the target language. It is one of three standard evaluation dimensions for automatic text simplification alongside complexity…
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