| oca | (noun) South American wood sorrel cultivated for its edible tubers | Synonyms: oka, Oxalis crenata, Oxalis tuberosa |
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| ocarina | (noun) egg-shaped terracotta wind instrument with a mouthpiece and finger holes | Synonyms: sweet potato |
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| occasion | (noun) an event that occurs at a critical time | Synonyms: juncture |
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| (noun) a formal or official social gathering or ceremony of people | Synonyms: affair, function, social affair, social function, social gathering, social occasion |
| (noun) a rational motive for a belief or action | Synonyms: ground, reason |
| (noun) an opportunity to do something | - |
| (noun) the time of a particular event | - |
| occasions | (noun) something you have to do | - |
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| occident | (noun) the hemisphere that includes North America and South America | Synonyms: western hemisphere |
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| occidentalism | (noun) the quality or customs or mannerisms characteristic of Western civilizations | - |
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| occiput | (noun) back part of the head or skull | - |
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| occlusion | (noun) the act of blocking | Synonyms: blockage, closure |
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| (noun) an obstruction in a pipe or tube | Synonyms: block, blockage, closure, stop, stoppage |
| (noun) (dentistry) the normal spatial relation of the teeth when the jaws are closed | - |
| (noun) (meteorology) a composite front when colder air surrounds a mass of warm air and forces it aloft | Synonyms: occluded front |
| (noun) closure or blockage (as of a blood vessel) | - |
| occlusive | (noun) a consonant produced by stopping the flow of air at some point and suddenly releasing it | Synonyms: plosive, plosive consonant, plosive speech sound, stop, stop consonant |
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| occult | (noun) supernatural practices and techniques | Synonyms: occult arts |
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| (noun) supernatural forces and events and beings collectively | Synonyms: supernatural |
| occultation | (noun) one celestial body obscures another | Synonyms: eclipse |
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| occultism | (noun) a belief in supernatural powers and the possibility of bringing them under human control | - |
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| (noun) the study of the supernatural | - |
| occultist | (noun) a believer in occultism; someone versed in the occult arts | - |
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| occupancy | (noun) an act of being a tenant or occupant | Synonyms: tenancy |
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| (noun) the act of occupying or taking possession of a building | Synonyms: moving in, occupation |
| occupant | (noun) someone who lives at a particular place for a prolonged period or who was born there | Synonyms: occupier, resident |
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| occupation | (noun) the principal activity in your life that you do to earn money | Synonyms: business, job, line, line of work |
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| (noun) the act of occupying or taking possession of a building | Synonyms: moving in, occupancy |
| (noun) the control of a country by military forces of a foreign power | Synonyms: military control |
| (noun) any activity that occupies a person's attention | - |
| (noun) the period of time during which a place or position or nation is occupied | - |
| occupier | (noun) someone who lives at a particular place for a prolonged period or who was born there | Synonyms: occupant, resident |
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| (noun) a member of a military force who is residing in a conquered foreign country | - |
| occurrence | (noun) an event that happens | Synonyms: happening, natural event, occurrent |
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| (noun) an instance of something occurring | - |
| occurrent | (noun) an event that happens | Synonyms: happening, natural event, occurrence |
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| ocean | (noun) a large body of water constituting a principal part of the hydrosphere | - |
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| (noun) anything apparently limitless in quantity or volume | Synonyms: sea |
| oceanaut | (noun) a skilled worker who can live in underwater installations and participate in scientific research | Synonyms: aquanaut |
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| oceanfront | (noun) land bordering an ocean | - |
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| oceanographer | (noun) a scientist who studies physical and biological aspects of the seas | - |
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| oceanography | (noun) the branch of science dealing with physical and biological aspects of the oceans | Synonyms: oceanology |
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| oceanology | (noun) the branch of science dealing with physical and biological aspects of the oceans | Synonyms: oceanography |
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| ocellus | (noun) an eyelike marking (as on the wings of some butterflies); usually a spot of color inside a ring of another color | Synonyms: eyespot |
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| (noun) an eye having a single lens | Synonyms: simple eye, stemma |
| ocelot | (noun) nocturnal wildcat of Central America and South America having a dark-spotted buff-brown coat | Synonyms: Felis pardalis, panther cat |
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| ocher | (noun) a moderate yellow-orange to orange color | Synonyms: ochre |
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| (noun) any of various earths containing silica and alumina and ferric oxide; used as a pigment | Synonyms: ochre |
| ochlocracy | (noun) a political system in which a mob is the source of control; government by the masses | Synonyms: mobocracy |
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| ochre | (noun) a moderate yellow-orange to orange color | Synonyms: ocher |
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| (noun) any of various earths containing silica and alumina and ferric oxide; used as a pigment | Synonyms: ocher |
| ochronosis | (noun) an accumulation of dark pigment in cartilage and other connective tissue; usually a symptom of alkaptonuria or phenol poisoning | - |
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| ocotillo | (noun) desert shrub of southwestern United States and Mexico having slender naked spiny branches that after the rainy season put forth foliage and clusters of red flowers | Synonyms: coachwhip, Fouquieria splendens, Jacob's staff, vine cactus |
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| octad | (noun) the cardinal number that is the sum of seven and one | Synonyms: 8, eight, eighter, eighter from Decatur, octet, octonary, ogdoad, VIII |
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| octagon | (noun) an eight-sided polygon | - |
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| octahedron | (noun) any polyhedron having eight plane faces | - |
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| octameter | (noun) a verse line having eight metrical feet | - |
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| octane | (noun) any isomeric saturated hydrocarbon found in petroleum and used as a fuel and solvent | - |
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| octant | (noun) a measuring instrument for measuring angles to a celestial body; similar to a sextant but with 45 degree calibration | - |
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| octave | (noun) a musical interval of eight tones | Synonyms: musical octave |
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| (noun) a rhythmic group of eight lines of verse | - |
| (noun) a feast day and the seven days following it | - |
| octavo | (noun) the size of a book whose pages are made by folding a sheet of paper three times to form eight leaves | Synonyms: 8vo, eightvo |
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| octet | (noun) a musical composition written for eight performers | Synonyms: octette |
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| (noun) eight people considered as a unit | Synonyms: eightsome, octette |
| (noun) a set of eight similar things considered as a unit | Synonyms: octette |
| (noun) eight performers or singers who perform together | Synonyms: octette |
| (noun) the cardinal number that is the sum of seven and one | Synonyms: 8, eight, eighter, eighter from Decatur, octad, octonary, ogdoad, VIII |
| octette | (noun) a musical composition written for eight performers | Synonyms: octet |
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| (noun) eight people considered as a unit | Synonyms: eightsome, octet |
| (noun) a set of eight similar things considered as a unit | Synonyms: octet |
| (noun) eight performers or singers who perform together | Synonyms: octet |
| octillion | (noun) the number that is represented as a one followed by 27 zeros | - |
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| octogenarian | (noun) someone whose age is in the eighties | - |
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| octonary | (noun) the cardinal number that is the sum of seven and one | Synonyms: 8, eight, eighter, eighter from Decatur, octad, octet, ogdoad, VIII |
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| octopod | (noun) a cephalopod with eight arms but lacking an internal shell | - |
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| octopus | (noun) bottom-living cephalopod having a soft oval body with eight long tentacles | Synonyms: devilfish |
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| (noun) tentacles of octopus prepared as food | - |
| octoroon | (noun) an offspring of a quadroon and a white parent; a person who is one-eighth black | - |
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| octosyllable | (noun) a verse line having eight syllables or a poem of octosyllabic lines | - |
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| octroi | (noun) a tax on various goods brought into a town | - |
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| ocular | (noun) combination of lenses at the viewing end of optical instruments | Synonyms: eyepiece |
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| oculism | (noun) the craft of an oculist | - |
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| oculist | (noun) a medical doctor specializing in the diagnosis and treatment of diseases of the eye | Synonyms: eye doctor, ophthalmologist |
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| (noun) a person skilled in testing for defects of vision in order to prescribe corrective glasses | Synonyms: optometrist |
| oculomotor | (noun) supplies extrinsic muscles of the eye | Synonyms: nervus oculomotorius, oculomotor nerve, third cranial nerve |
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| oculus | (noun) the organ of sight | Synonyms: eye, optic |
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