Oktant (lotini octane — hashtyaki davra), oktan, asbobi zoviyasanj buda, qismi asosii onro kamone tashkil medihad, ki ba hashtyaki davra barobar ast va on ba darajavu hissahoi daraja taqsim karda shudaast. Odatan, asbobhoero Oktant menomand, ki az rui sokhtashon ba sek­stant monandand. Hozir Oktanthoro kam istifoda mebarand.

Okrugi avtonomii Evenkho, Evenkiya, dar hayati kishvari Kras­noyarski RSFSR. 10 dekabri 1930 (to 1977 Okrugi millii Evenk) tashkil shu- daast. Masohat 767,6 hazor kilometr2. Aholiash 16 hazor nafar (1979). Ba 3 rayoni mamuri va 1 posyolkai tipi shahr taqsim shudaast. Markazash posyolkai Tura. Tabiat. Okrugi avtonomii Evenkho dar qismi marka­zii …

Oktaedr (lotini oklaedron, az okto — hasht va hedre ruya), yake az panj bisyorruyai muntazam, ki 8 ruya (sekunda), 12 tega, 6 qulla (dar qar yak qulla 4 tega hamdoya meshavand) dorad. Agar a darozii tega boshad, hajmi Oktant chunin ast: V – Hill 0.4714 a3.

Okrugi avtonomi, d a r S S S R yake az shaklhoi amaligardonii av- tonomiyai mamuri meboshad. To qabuli Kosnstitutsiyai SSSR (1977) Okrugi avtonomiro okrugi milli menomidand. Okrugi avtonomi dar hududi hayati aholiash yakkhela tashkil yofta, bo khususiyathoi tarkibi milli va tarzi zindagonii aholi farq mekunad va ba hayati kishvar …

«Oktyabri surkh», gazeta, organi komiteti rayonii PK Tojikiston va Sove­ti deputathoi mehnatkashoni payoni Oktyabr (hozira payoni Vakhsh). Az soli 1938 to 1959 bo tiraji 3500 nuskha haftae 3 marotiba ba zabonhoi tojiki va uzbeki nashr meshud.

Oyunskiy Platon Alekseevich (I. I. 1893 — 31. 10. 1939), navisandai sovetii yoqut, khodimi jamiyati, asosguzori adabiyoti sovetii yoqut. Dar ulusi Tatin (hozira payoni Alek­seevsk) dar oilai dehqon tavallud shudaast. Azoi KPSS az soli 1918. Az avvali soli 1917 azoi makhfili sotsial-demokratho bud. Az ogozi Revolyutsiyai fevrali 1917 ba muborizai …

Oykhonum, dimnai shahri Yunonu Bokhtari mansub ba asrhoi 4—1 to milod, ki dar Afgonistoni Shimoli, dar rezishgohi daryoi Kukcha (shokhobi daryoi Panj) voqe ast. Az soli 1965 az tarafi Missiyai ar­kheologii Fransiya dar Afgoniston omukhta meshavad. Holo hafriyoti bolohisor, mabad, markazi siyosi, maqbaraho va qismi ziyodi shahr ba intiho rasidaast. …

Okrugi avtonomii Koryakho, dar hayati viloyati Kamchatkai RSFSR. 10 dekabri 1930 tashkil yoftaast. Masohat 301,5 hazor kilometr2. Aholi 34 hazkhor nafar (1979). Dar Okrugi avtonomii  Koryakho asosan rusho, koryakho, chukchikho, itelmenho va evenho zindagi mekunand. Zichii mi­yonai aholi dar 1 kilometr2 0,1 nafar. Ba 4 rayoni mamuri va 5 poselkai …

Oka daryoest dar qismi evropoii SSSR, kalontarin va purobtarin shokhobi rosti daryoi Volga. Tulash 1500 kilometr, masohatash havzaash 245 hazor kilometr2. Az qismi markazii Balandii Miyonai Rus ibtido yofta, dar nazdikii sh.ahri Gorkiy ba daryoi Volga merezad. Aa sargahash to hamroh shudani daryoi Mo­skva dar vodii barash to 3 kilometr …

Okrugi Avtonomii Nenesho, dar hayati viloyati Arkhangelski RSFSR. 15 iyuli 1929 tashkil shudaast. Dar intihoi Shimoli Sharq hamvorii Evropai Sharqi voqe ast. Onro bahrhoi Safed, Barens, Pechora, Kara ihota kardaand. Masohati 176,7  hazor kilometr2. Aholiash 47 hazor nafar (1979). Asosan Nenesho, rusho, inchunin komiho, ukrainho va digar khalqho zindagi mekunand. …