Where does this definition of external signal come from?
This entry for external signal is sourced from Main Dictionary, one of the dictionaries and corpora merged into Lughet.
Does external signal appear elsewhere on Lughet?
Yes — external signal 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.