| 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 |