Where does this definition of essential spectrum come from?
This entry for essential spectrum is sourced from GetWord Corpus, one of the dictionaries and corpora merged into Lughet.
Does essential spectrum appear elsewhere on Lughet?
Yes — essential spectrum 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.