| hypersomnia | (noun) an inability to stay awake | - |
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| insomnia | (noun) an inability to sleep; chronic sleeplessness | - |
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| insomniac | (adjective) experiencing or accompanied by sleeplessness | Synonyms: sleepless, watchful |
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| (noun) someone who cannot sleep | Synonyms: sleepless person |
| omnibus | (adjective) providing for many things at once | - |
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| (noun) a vehicle carrying many passengers; used for public transport | Synonyms: autobus, bus, charabanc, coach, double-decker, jitney, motorbus, motorcoach, passenger vehicle |
| (noun) an anthology of articles on a related subject or an anthology of the works of a single author | - |
| omnidirectional | (adjective) not directional | - |
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| omnifarious | (adjective) of all varieties or forms or kinds | - |
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| omnipotence | (noun) the state of being omnipotent; having unlimited power | - |
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| omnipotent | (adjective) having unlimited power | Synonyms: all-powerful, almighty |
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| omnipresence | (noun) the state of being everywhere at once (or seeming to be everywhere at once) | Synonyms: ubiquitousness, ubiquity |
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| omnipresent | (adjective) being present everywhere at once | Synonyms: ubiquitous |
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| omnirange | (noun) a navigational system consisting of a network of radio beacons that provide aircraft with information about exact position and bearing | Synonyms: omnidirectional radio range, omnidirectional range |
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| omniscience | (noun) the state of being omniscient; having infinite knowledge | - |
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| omniscient | (adjective) infinitely wise | Synonyms: all-knowing |
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| omnivore | (noun) an animal that feeds on both animal and vegetable substances | - |
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| (noun) a person who eats all kinds of foods | - |
| omnivorous | (adjective) feeding on both plants and animals | - |
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| omnivorousness | (noun) The state of eating both animal and plant matter. | - |
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| somniferous | (adjective) sleep inducing | Synonyms: hypnagogic, hypnogogic, somnific, soporiferous, soporific |
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| somnific | (adjective) sleep inducing | Synonyms: hypnagogic, hypnogogic, somniferous, soporiferous, soporific |
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| somniloquism | (noun) uttering speech while asleep | Synonyms: sleep talking, somniloquy |
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| somniloquist | (noun) someone who talks while asleep | - |
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| somniloquy | (noun) uttering speech while asleep | Synonyms: sleep talking, somniloquism |
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