Where does this definition of retention index come from?
This entry for retention index is sourced from Main Dictionary, one of the dictionaries and corpora merged into Lughet.
Does retention index appear elsewhere on Lughet?
Yes — retention index appears under other sources or language pairs in Lughet's collection. See the list below.
What is Lughet?
Lughet is a free trilingual dictionary covering nearly five million entries across Uyghur, Chinese, and English, drawn from more than ten source dictionaries and corpora.