| 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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| odalisque | (noun) a woman slave in a harem | - |
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| odd | (adjective) not divisible by two | Synonyms: uneven |
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| (adjective) an indefinite quantity more than that specified | - |
| (adjective) of the remaining member of a pair | Synonyms: unmatched, unmated, unpaired |
| (adjective) beyond or deviating from the usual or expected | Synonyms: curious, funny, peculiar, queer, rum, rummy, singular |
| (adjective) not used up | Synonyms: left, left over, leftover, remaining, unexpended |
| (adjective) not easily explained | - |
| oddball | (noun) a person with an unusual or odd personality | Synonyms: eccentric, eccentric person, flake, geek |
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| oddish | (adjective) somewhat strange | - |
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| oddity | (noun) something unusual -- perhaps worthy of collecting | Synonyms: curio, curiosity, oddment, peculiarity, rarity |
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| (noun) a strange attitude or habit | Synonyms: crotchet, queerness, quirk, quirkiness |
| (noun) eccentricity that is not easily explained | Synonyms: oddness |
| oddly | (adverb) in a manner differing from the usual or expected | Synonyms: curiously, inexplicably, peculiarly |
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| (adverb) in a strange manner | Synonyms: funnily, queerly, strangely |
| oddment | (noun) a piece of cloth that is left over after the rest has been used or sold | Synonyms: end, remainder, remnant |
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| (noun) something unusual -- perhaps worthy of collecting | Synonyms: curio, curiosity, oddity, peculiarity, rarity |
| oddments | (noun) a motley assortment of things | Synonyms: farrago, gallimaufry, hodgepodge, hotchpotch, melange, mingle-mangle, mishmash, odds and ends, omnium-gatherum, ragbag |
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| oddness | (noun) eccentricity that is not easily explained | Synonyms: oddity |
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| (noun) the parity of odd numbers (not divisible by two) | - |
| odds | (noun) the likelihood of a thing occurring rather than not occurring | - |
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| (noun) the ratio by which one better's wager is greater than that of another | Synonyms: betting odds |
| ode | (noun) a lyric poem with complex stanza forms | - |
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| odious | (adjective) unequivocally detestable | Synonyms: abominable, detestable, execrable |
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| odiously | (adverb) in an offensive and hateful manner | Synonyms: abominably, detestably, repulsively |
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| odiousness | (noun) the quality of being offensive | Synonyms: distastefulness, offensiveness |
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| odist | (noun) a poet who writes odes | - |
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| odium | (noun) hate coupled with disgust | Synonyms: abhorrence, abomination, detestation, execration, loathing |
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| (noun) state of disgrace resulting from detestable behavior | - |
| odometer | (noun) a meter that shows mileage traversed | Synonyms: hodometer, mileometer, milometer |
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| odonate | (noun) large primitive predatory aquatic insect having two pairs of membranous wings | - |
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| odontalgia | (noun) an ache localized in or around a tooth | Synonyms: toothache |
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| odontiasis | (noun) the eruption through the gums of baby teeth | Synonyms: dentition, teething |
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| odontoglossum | (noun) any of numerous and diverse orchids of the genus Odontoglossum having racemes of few to many showy usually large flowers in many colors | - |
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| odontology | (noun) the branch of medicine dealing with the anatomy and development and diseases of the teeth | Synonyms: dental medicine, dentistry |
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| odor | (noun) any property detected by the olfactory system | Synonyms: aroma, odour, olfactory property, scent, smell |
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| (noun) the sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous form | Synonyms: odour, olfactory perception, olfactory sensation, smell |
| odoriferous | (adjective) having a natural fragrance | Synonyms: odorous, perfumed, scented, sweet-scented, sweet-smelling, sweet |
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| (adjective) emitting an odor | Synonyms: odorous |
| odorize | (verb) cause to smell or be smelly | Synonyms: odourise, scent |
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| odorless | (adjective) having no odor | Synonyms: inodorous, odourless |
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| odorous | (adjective) having odor or a characteristic odor | - |
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| (adjective) having a natural fragrance | Synonyms: odoriferous, perfumed, scented, sweet-scented, sweet-smelling, sweet |
| (adjective) emitting an odor | Synonyms: odoriferous |
| odour | (noun) any property detected by the olfactory system | Synonyms: aroma, odor, olfactory property, scent, smell |
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| (noun) the sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous form | Synonyms: odor, olfactory perception, olfactory sensation, smell |
| odourise | (verb) cause to smell or be smelly | Synonyms: odorize, scent |
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| odourless | (adjective) having no odor | Synonyms: inodorous, odorless |
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| odynophagia | (noun) severe pain on swallowing due to a disorder of the esophagus | - |
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| odyssey | (noun) a long wandering and eventful journey | - |
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| oecumenic | (adjective) concerned with promoting unity among churches or religions | Synonyms: ecumenic, ecumenical, oecumenical |
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| oecumenical | (adjective) of worldwide scope or applicability | Synonyms: cosmopolitan, ecumenical, general, universal, world-wide, worldwide |
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| (adjective) concerned with promoting unity among churches or religions | Synonyms: ecumenic, ecumenical, oecumenic |
| oecumenism | (noun) a movement promoting union between religions (especially between Christian churches) | Synonyms: ecumenism |
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| oedema | (noun) swelling from excessive accumulation of watery fluid in cells, tissues, or serous cavities | Synonyms: dropsy, edema, hydrops |
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| oedometer | (noun) an instrument for measuring the rate and amount of consolidation of a soil specimen under pressure. | - |
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| oenologist | (noun) a specialist in wine making | Synonyms: enologist, fermentologist |
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| oenology | (noun) the art of wine making | Synonyms: enology |
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| oenomel | (noun) wine mixed with honey | - |
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| oenophile | (noun) someone who appreciates wine | Synonyms: enophile |
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| oersted | (noun) the magnetic field strength 1 cm from a unit magnetic pole | - |
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| oesophagitis | (noun) inflammation of the esophagus; often caused by gastroesophageal reflux | Synonyms: esophagitis |
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