| overtaking | (noun) going by something that is moving in order to get in front of it | Synonyms: passing |
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| overthrow | (noun) the termination of a ruler or institution (especially by force) | - |
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| (noun) the act of disturbing the mind or body | Synonyms: derangement, upset |
| overtime | (noun) playing time beyond regulation, to break a tie | Synonyms: extra time |
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| (noun) work done in addition to regular working hours | - |
| overtolerance | (noun) too much permissiveness | - |
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| overtone | (noun) a harmonic with a frequency that is a multiple of the fundamental frequency | Synonyms: partial, partial tone |
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| (noun) (usually plural) an ulterior implicit meaning or quality | - |
| overture | (noun) a tentative suggestion designed to elicit the reactions of others | Synonyms: advance, approach, feeler |
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| (noun) orchestral music played at the beginning of an opera or oratorio | - |
| (noun) something that serves as a preceding event or introduces what follows | Synonyms: preliminary, prelude |
| overturn | (noun) the act of upsetting something | Synonyms: turnover, upset |
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| (noun) an improbable and unexpected victory | Synonyms: upset |
| overuse | (noun) exploitation to the point of diminishing returns | Synonyms: overexploitation, overutilisation, overutilization |
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| overutilisation | (noun) exploitation to the point of diminishing returns | Synonyms: overexploitation, overuse, overutilization |
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| overutilization | (noun) exploitation to the point of diminishing returns | Synonyms: overexploitation, overuse, overutilisation |
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| overvaluation | (noun) too high a value or price assigned to something | - |
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| (noun) an appraisal that is too high | Synonyms: overappraisal, overestimate, overestimation |
| overview | (noun) a general summary of a subject | - |
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| overwatch | (noun) surveillence by a unit within a video game which would cause the unit to make an action in response to an enemy unit's action | - |
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| overweight | (noun) the property of excessive fatness | Synonyms: adiposis, corpulence, stoutness |
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| overwork | (noun) the act of working too much or too long | Synonyms: overworking |
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| overworking | (noun) the act of working too much or too long | Synonyms: overwork |
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| overzeal | (noun) The quality of being excessively zealous. | Synonyms: overzealousness |
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| overzealousness | (noun) The quality of being excessively zealous. | Synonyms: overzeal |
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| oviduct | (noun) either of a pair of tubes conducting the egg from the ovary to the uterus | Synonyms: Fallopian tube, uterine tube |
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| ovipositor | (noun) egg-laying tubular structure at the end of the abdomen in many female insects and some fishes | - |
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| oviraptorid | (noun) advanced carnivorous theropods, characterized by their toothless, parrot-like beaks and, in several cases, elaborate crests | - |
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| ovoflavin | (noun) a B vitamin that prevents skin lesions and weight loss | Synonyms: hepatoflavin, lactoflavin, riboflavin, vitamin B2, vitamin G |
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| ovoid | (noun) an egg-shaped object | - |
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| ovolo | (noun) a convex molding having a cross section in the form of a quarter of a circle or of an ellipse | Synonyms: quarter round, thumb |
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| ovotestis | (noun) hermaphroditic gonad that contains both testicular and ovarian tissue | - |
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| ovulation | (noun) the expulsion of an ovum from the ovary (usually midway in the menstrual cycle) | - |
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| ovule | (noun) a small or immature ovum | - |
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| (noun) a small body that contains the female germ cell of a plant; develops into a seed after fertilization | - |
| ovum | (noun) the female reproductive cell; the female gamete | Synonyms: egg cell |
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