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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
wakefulness is a noun meaning "a periodic state during which you are conscious and aware of the world". It carries 3 recorded senses.
a periodic state during which you are conscious and aware of the world
“consciousness during wakefulness in a sane person is pretty well ordered and familiar”
a temporary state in which you are unable (or unwilling) to sleep
“accept your wakefulness and sleep in its own contrary way is more likely to come”
the process of paying close and continuous attention
“wakefulness, watchfulness, and bellicosity make a good hunter”
“vigilance is especially susceptible to fatigue”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for wakefulness come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.