| 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 |
| occidental | (adjective) denoting or characteristic of countries of Europe and the western hemisphere | Synonyms: Hesperian |
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| occipital | (adjective) of or relating to the occiput | - |
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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 | - |
| occlusive | (adjective) tending to occlude | - |
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| 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 | - |
| 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 |
| occurrent | (adjective) presently occurring (either causally or incidentally) | - |
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