Where does this definition of express letter come from?
This entry for express letter is sourced from GetWord Corpus, one of the dictionaries and corpora merged into Lughet.
Is express letter a noun, verb, or something else?
In this entry, express letter is tagged as 2n..
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.