Sentence:  The modern description of <WSD>Egyptian fraction</WSD> reckoning being "restricted" to unit fractions is obviously anachronistic (indeed, the Egyptian concept of fractions did not include a numerator, but from a historian's point of view this cannot be criticized on the basis that our modern fractions consist of denominator and numerator). Furthermore, this criticism does not do justice to the development of <WSD>Egyptian fractions</WSD>. 
Meaning of the word marked with <WSD> tags:  A representation of a rational number as a sum of distinct unit fractions.