| overconfidence | (noun) total certainty or greater certainty than circumstances warrant | Synonyms: certitude, cocksureness |
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| overcredulity | (noun) too much credulity | - |
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| overcrossing | (noun) a bridge designed for pedestrians | Synonyms: footbridge, pedestrian bridge |
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| overdraft | (noun) a draft in excess of the credit balance | - |
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| overdrive | (noun) a high gear used at high speeds to maintain the driving speed with less output power | - |
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| (noun) the state of high or excessive activity or productivity or concentration | - |
| overeating | (noun) eating to excess (personified as one of the deadly sins) | Synonyms: gluttony, gula |
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| overemphasis | (noun) too much emphasis | - |
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| overestimate | (noun) a calculation that results in an estimate that is too high | Synonyms: overestimation, overrating, overreckoning |
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| (noun) an appraisal that is too high | Synonyms: overappraisal, overestimation, overvaluation |
| overestimation | (noun) a calculation that results in an estimate that is too high | Synonyms: overestimate, overrating, overreckoning |
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| (noun) an appraisal that is too high | Synonyms: overappraisal, overestimate, overvaluation |
| overexertion | (noun) excessive exertion; so much exertion that discomfort or injury results | - |
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| overexploitation | (noun) exploitation to the point of diminishing returns | Synonyms: overuse, overutilisation, overutilization |
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| overexposure | (noun) the act of exposing film to too much light or for too long a time | - |
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| (noun) the act of exposing someone excessively to an influencing experience | - |
| overfamiliarity | (noun) The state of being common or repeated to the point of being unnoticed or annoying. | - |
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| overfeeding | (noun) excessive feeding | - |
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| overflight | (noun) a flight by an aircraft over a particular area (especially over an area in foreign territory) | - |
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| overflow | (noun) a large flow | Synonyms: flood, outpouring |
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| (noun) the occurrence of surplus liquid (as water) exceeding the limit or capacity | Synonyms: overspill, runoff |
| overgarment | (noun) a garment worn over other garments | Synonyms: outer garment |
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| overgrowth | (noun) a profusion of growth on or over something else | - |
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| (noun) excessive size; usually caused by excessive secretion of growth hormone from the pituitary gland | Synonyms: giantism, gigantism |
| overhang | (noun) projection that extends beyond or hangs over something else | - |
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| overhaul | (noun) periodic maintenance on a car or machine | Synonyms: inspection and repair, service |
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| (noun) the act of improving by renewing and restoring | Synonyms: redevelopment, renovation |
| overhead | (noun) a hard return hitting the tennis ball above your head | Synonyms: smash |
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| (noun) (nautical) the top surface of an enclosed space on a ship | - |
| (noun) a transparency for use with an overhead projector | Synonyms: viewgraph |
| (noun) (computer science) the disk space required for information that is not data but is used for location and timing | Synonyms: disk overhead |
| (noun) the expense of maintaining property (e.g., paying property taxes and utilities and insurance); it does not include depreciation or the cost of financing or income taxes | Synonyms: budget items, operating cost, operating expense |
| (noun) (computer science) the processing time required by a device prior to the execution of a command | Synonyms: command overhead, command processing overhead, command processing overhead time |
| overheating | (noun) excessive heating | - |
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| overindulgence | (noun) excessive indulgence | Synonyms: excess |
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| overinterpretation | (noun) Excessive interpretation. | - |
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| overkill | (noun) any effort that seems to go farther than would be necessary to achieve its goal | - |
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| (noun) the capability to obliterate a target with more weapons (especially nuclear weapons) than are required | - |
| overlap | (noun) a flap that lies over another part | Synonyms: lap |
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| (noun) the property of partial coincidence in time | - |
| (noun) a representation of common ground between theories or phenomena | Synonyms: convergence, intersection |
| overlapping | (noun) covering with a design in which one element covers a part of another (as with tiles or shingles) | Synonyms: imbrication, lapping |
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| overlay | (noun) protective covering consisting, for example, of a layer of boards applied to the studs and joists of a building to strengthen it and serve as a foundation for a weatherproof exterior | Synonyms: overlayer, sheathing |
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| (noun) a layer of decorative material (such as gold leaf or wood veneer) applied over a surface | - |
| overlayer | (noun) protective covering consisting, for example, of a layer of boards applied to the studs and joists of a building to strengthen it and serve as a foundation for a weatherproof exterior | Synonyms: overlay, sheathing |
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| overlip | (noun) the upper lip | - |
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| overload | (noun) an excessive burden | Synonyms: overburden |
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| (noun) an electrical load that exceeds the available electrical power | - |
| overlook | (noun) a high place affording a good view | - |
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| overlord | (noun) a person who has general authority over others | Synonyms: lord, master |
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| overlordship | (noun) the position of overlord | - |
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| overmantel | (noun) a shelf over a mantelpiece | - |
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| overmuch | (noun) a quantity that is more than what is appropriate | Synonyms: overabundance, overmuchness, superabundance |
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| overmuchness | (noun) a quantity that is more than what is appropriate | Synonyms: overabundance, overmuch, superabundance |
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| overnighter | (noun) a small traveling bag to carry clothing and accessories for staying overnight | Synonyms: overnight bag, overnight case |
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| (noun) a guest who stays overnight | - |
| overpass | (noun) bridge formed by the upper level of a crossing of two highways at different levels | Synonyms: flyover |
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| overpayment | (noun) the act of paying too much | - |
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| (noun) a payment larger than needed or expected | - |
| overplus | (noun) extreme excess | Synonyms: embarrassment, plethora, superfluity |
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| overpopulation | (noun) too much population | - |
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| overpraise | (noun) excessive or undeserved praise. | - |
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| overpressure | (noun) a transient air pressure greater than the surrounding atmospheric pressure | - |
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| overprint | (noun) something added by overprinting | Synonyms: surprint |
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| overproduction | (noun) too much production or more than expected | Synonyms: overrun |
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| overprotection | (noun) excessive protection | Synonyms: momism, overshielding |
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| overrating | (noun) a calculation that results in an estimate that is too high | Synonyms: overestimate, overestimation, overreckoning |
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| overreaction | (noun) an excessive reaction; a reaction with inappropriate emotional behavior | - |
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| overreckoning | (noun) a calculation that results in an estimate that is too high | Synonyms: overestimate, overestimation, overrating |
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| overrefinement | (noun) the act of distorting something so it seems to mean something it was not intended to mean | Synonyms: distortion, straining, torture, twisting |
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| override | (noun) the act of nullifying; making null and void; counteracting or overriding the effect or force of something | Synonyms: nullification |
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| (noun) a manually operated device to correct the operation of an automatic device | - |
| overrun | (noun) too much production or more than expected | Synonyms: overproduction |
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| overseer | (noun) a person who directs and manages an organization | Synonyms: superintendent |
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| oversensitiveness | (noun) sensitivity leading to easy irritation or upset | - |
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| overshielding | (noun) excessive protection | Synonyms: momism, overprotection |
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| overshoe | (noun) footwear that protects your shoes from water or snow or cold | - |
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| overshoot | (noun) an approach that fails and gives way to another attempt | Synonyms: go-around, wave-off |
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| oversight | (noun) a mistake resulting from inattention | Synonyms: lapse |
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| (noun) management by overseeing the performance or operation of a person or group | Synonyms: superintendence, supervising, supervision |
| (noun) an unintentional omission resulting from failure to notice something | Synonyms: inadvertence |
| oversimplification | (noun) an act of excessive simplification; the act of making something seem simpler than it really is | Synonyms: simplism |
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| (noun) an explanation that simplifies too far to the point of misrepresentation | Synonyms: simplism |
| overskirt | (noun) an outer skirt worn over another skirt | - |
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| overspill | (noun) the occurrence of surplus liquid (as water) exceeding the limit or capacity | Synonyms: overflow, runoff |
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| (noun) the relocation of people from overcrowded cities; they are accommodated in new houses or apartments in smaller towns | - |
| overstatement | (noun) making to seem more important than it really is | Synonyms: exaggeration, magnification |
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| oversteer | (noun) when a car turns (steers) by more than (over) the amount commanded by the driver. | - |
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| overstrain | (noun) too much strain | - |
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| oversupply | (noun) the quality of being so overabundant that prices fall | Synonyms: glut, surfeit |
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| 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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| paloverde | (noun) a thorny shrub of the genus Cercidium that grows in dry parts of the southwestern United States and adjacent Mexico; has smooth light green bark and racemes of yellow flowers and small leaves | - |
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| papovavirus | (noun) any of a group of animal viruses associated with or causing papillomas or polyomas | - |
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| papulovesicle | (noun) a papule that changes into a blister | Synonyms: vesicopapule |
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| parafovea | (noun) area of the retina immediately surrounding the fovea | - |
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| paramyxovirus | (noun) a group of viruses including those causing mumps and measles | - |
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| parvovirus | (noun) any of a group of viruses containing DNA in an icosahedral protein shell and causing disease in dogs and cattle; not known to be associated with any human disease | Synonyms: parvo |
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