| 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 | - |
| (verb) give occasion to | - |
| occasional | (adjective) occurring from time to time | - |
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| (adjective) occurring on a temporary or irregular basis | Synonyms: casual |
| (adjective) recurring or reappearing from time to time | Synonyms: periodic |
| (adjective) occurring or appearing at usually irregular intervals | Synonyms: episodic |
| occasionally | (adverb) sporadically and infrequently | Synonyms: at times, from time to time, now and again, now and then, on occasion, once in a while |
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| 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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| occidental | (adjective) denoting or characteristic of countries of Europe and the western hemisphere | Synonyms: Hesperian |
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| occidentalise | (verb) make western in character | Synonyms: occidentalize, westernise, westernize |
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| occidentalism | (noun) the quality or customs or mannerisms characteristic of Western civilizations | - |
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| occidentalize | (verb) make western in character | Synonyms: occidentalise, westernise, westernize |
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| occipital | (adjective) of or relating to the occiput | - |
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| occiput | (noun) back part of the head or skull | - |
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| occlude | (verb) block passage through | Synonyms: block, close up, impede, jam, obstruct, obturate |
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| occluded | (adjective) (of a substance) taken into and retained in another substance | Synonyms: sorbed |
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| (adjective) closed off | - |
| 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 | (adjective) tending to occlude | - |
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| (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 |
| occult | (adjective) having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding | Synonyms: mysterious, mystic, mystical, orphic, secret |
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| (adjective) hidden and difficult to see | - |
| (noun) supernatural practices and techniques | Synonyms: occult arts |
| (noun) supernatural forces and events and beings collectively | Synonyms: supernatural |
| (verb) hide from view | - |
| (verb) cause an eclipse of (a celestial body) by intervention | Synonyms: eclipse |
| (verb) become concealed or hidden from view or have its light extinguished | - |
| 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 | - |
| occupational | (adjective) of or relating to the activity or business for which you are trained | - |
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| occupied | (adjective) held or filled or in use | - |
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| (adjective) seized and controlled as by military invasion | - |
| (adjective) having ones attention or mind or energy engaged | Synonyms: engaged |
| (adjective) resided in; having tenants | Synonyms: tenanted |
| 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 | - |
| occupy | (verb) consume all of one's attention or time | Synonyms: absorb, engage, engross |
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| (verb) march aggressively into another's territory by military force for the purposes of conquest and occupation | Synonyms: invade |
| (verb) require (time or space) | Synonyms: take, use up |
| (verb) keep busy with | Synonyms: busy |
| (verb) assume, as of positions or roles | Synonyms: fill, take |
| (verb) live (in a certain place) | Synonyms: lodge in, reside |
| (verb) occupy the whole of | Synonyms: fill |
| (verb) be on the mind of | Synonyms: concern, interest, worry |
| occur | (verb) come to pass | Synonyms: come about, fall out, go on, hap, happen, pass, pass off, take place |
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| (verb) come to one's mind; suggest itself | Synonyms: come |
| (verb) to be found to exist | - |
| occurrence | (noun) an event that happens | Synonyms: happening, natural event, occurrent |
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| (noun) an instance of something occurring | - |
| occurrent | (adjective) presently occurring (either causally or incidentally) | - |
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| (noun) an event that happens | Synonyms: happening, natural event, occurrence |
| 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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| oceangoing | (adjective) used on the high seas | Synonyms: seafaring, seagoing |
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| oceanic | (adjective) relating to or occurring or living in or frequenting the open ocean | Synonyms: pelagic |
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| (adjective) constituting or living in the open sea | - |
| (adjective) resembling the ocean in apparent limitlessness in extent or degree | - |
| 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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| ocellated | (adjective) having ocelli | - |
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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 | (adjective) of a moderate orange-yellow color | Synonyms: ochre |
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| (noun) a moderate yellow-orange to orange color | Synonyms: ochre |
| (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 | (adjective) of a moderate orange-yellow color | Synonyms: ocher |
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| (noun) a moderate yellow-orange to orange color | Synonyms: ocher |
| (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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| octagonal | (adjective) of or relating to or shaped like an octagon | Synonyms: octangular |
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| octahedron | (noun) any polyhedron having eight plane faces | - |
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| octal | (adjective) of or pertaining to a number system having 8 as its base | - |
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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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| octangular | (adjective) of or relating to or shaped like an octagon | Synonyms: octagonal |
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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 | (adjective) being from 80 to 89 years old | - |
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| (noun) someone whose age is in the eighties | - |
| 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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| octosyllabic | (adjective) having or characterized by or consisting of eight syllables | - |
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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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| octuple | (adjective) having eight units or components | Synonyms: eight-fold, eightfold |
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| ocular | (adjective) of or relating to or resembling the eye | Synonyms: ophthalmic, optic, optical |
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| (adjective) relating to or using sight | Synonyms: optic, optical, visual |
| (adjective) visible | Synonyms: visual |
| (noun) combination of lenses at the viewing end of optical instruments | Synonyms: eyepiece |
| 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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