Standard Lemma guide
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
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noun
A chronic state of low-grade exhaustion caused by too little or fitful sleep.
Definition source: English Wiktionary via Wiktextract
Usage: neologism, uncountable
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
History
From Latin semi- (“half”) + somnus (“sleep”) + -ia. Compare with insomnia. Coined by British sleep expert Neil Stanley in 2007.
