| intolerance | (noun) impatience with annoyances | - |
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| (noun) unwillingness to recognize and respect differences in opinions or beliefs | - |
| intonation | (noun) the act of singing in a monotonous tone | Synonyms: chanting |
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| (noun) singing by a soloist of the opening piece of plainsong | - |
| (noun) the production of musical tones (by voice or instrument); especially the exactitude of the pitch relations | - |
| (noun) rise and fall of the voice pitch | Synonyms: modulation, pitch contour |
| intoxicant | (noun) a drug that can produce a state of intoxication | - |
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| (noun) a liquor or brew containing alcohol as the active agent | Synonyms: alcohol, alcoholic beverage, alcoholic drink, inebriant |
| intoxication | (noun) excitement and elation beyond the bounds of sobriety | - |
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| (noun) a temporary state resulting from excessive consumption of alcohol | Synonyms: drunkenness, inebriation, inebriety, insobriety, tipsiness |
| (noun) the physiological state produced by a poison or other toxic substance | Synonyms: poisoning, toxic condition |