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| OBSTACLE | | n. Thing that obstructs progress. [latin obsto stand in the way] | |
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| OBSTRUCT | | v. - block up; make hard or impossible to pass along or through.
- prevent or retard the progress of. [latin obstruo obstruct- block up] | |
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| OCCASION | | —n. - a special event or happening. B time of this.
- reason, need.
- suitable juncture, opportunity.
- immediate but subordinate cause. —v. Cause, esp. Incidentally. on occasion now and then; when the need arises. [latin occido occas- go down] | |
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| OCCIDENT | | n. Poet. Or rhet. - (prec. By the) west.
- western europe.
- europe and america as distinct from the orient. [latin occidens -entis setting, sunset, west] | |
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| OCCUPANT | | n. Person who occupies, esp. Lives in, a place etc. occupancy n. (pl. -ies). [latin: related to *occupy] | |
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| OCCUPIER | | n. Person living in a house etc. As its owner or tenant. | |
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| ODOMETER | | n. Us = *milometer. [greek hodos way] | |
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| OFFERING | | n. - contribution or gift, esp. Of money.
- thing offered as a sacrifice etc. | |
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| OFFICIAL | | secrets n.pl. Confidential information involving national security.
- —adj. - of an office or its tenure.
- characteristic of officials and bureaucracy.
- properly authorized. —n. Person holding office or engaged in official duties. officialdom n. Officially adv. | |
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| OFFPISTE | | adj. (of skiing) away from prepared ski runs. | |
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