Abbreviation of Latin oculus sinister.

OS

1. (optometry) the left eye

• O.S.

• OD (“right eye”)

• IPA^(key): /ˌoʊ ˈɛs/

• Audio (US):

  (file)

OS

1. (sports) Initialism of Owen Sound.
2. The Ordnance Survey, official mapping agency in Great Britain (see also the noun below).

   Related terms: OSNI

3. (linguistics) Initialism of Old Saxon.

OS (not comparable)

1. Initialism of outsize, clothes for large people.
2. Initialism of oversize.
3. Initialism of Old Style, a term used in English language historical studies to indicate that a date conforms to the Julian calendar instead of the modern Gregorian calendar.
4. (screenwriting) Abbreviation of offscreen, indicating a line of dialogue is spoken by someone not visible onscreen.
5. (film) Initialism of over shoulder.

OS (not comparable)

1. (Australia, informal) Initialism of overseas.
   • 2015, Mick Houghton, I've Always Kept a Unicorn: The Biography of Sandy Denny:

     You did the overseas trip. You went OS.

   • 2022, The Betoota Advocate, The Australian Dream: Sell everything and move to Betoota, page 33:

     I kind of expanded my circle a bit more when I went OS [overseas].

OS (plural OSes or OSs)

1. (UK) An Ordnance Survey map.

   We've got an OS of the Cuckmere area.

   Calton Hill in Edinburgh is located at OS grid ref NT262741.

2. (software) Initialism of operating system.

   I've decided to install two different OSes on my new laptop.

   • 2008, Karim Yaghmour, Jon Masters, Gilad Ben-Yossef, Building Embedded Linux Systems:

     Some vendors do now have a variant of the per-unit royalty (usually termed a “shared risk,” or similar approach), but it is not strictly the same as for those proprietary embedded OSes mentioned before […]

   • 2010, Jorge Orchilles, Microsoft Windows 7 Administrator's Reference:

     A policy-created scheduled task will be accepted by computers running client OSes as old as Windows 2000 […]

   • 2009, Emmett Dulaney, CompTIA A+ Complete Review Guide:

     In a dual-boot configuration, you install two OSs on the computer (Windows XP and Windows 2000, for example).

3. Initialism of ordinary seaman.
4. Initialism of oppidan scholar.

• SO, S/O, s.o., so, So, So., S&O, s/o, S.O.

From initialism of English off-screen or English overlapping sound.

This entry needs pronunciation information. If you are familiar with the IPA then please add some!

OS

1. (chiefly Taiwan, Internet slang) internal monologue

• IPA^(key): [ˈoːɛʃː]

OS (plural OS-ek)

1. (computing) abbreviation of operating system

   Synonym: operációs rendszer

 OS on Japanese Wikipedia

From English OS.

• (Tokyo) オーエス [òóéꜜsù] (Nakadaka – [3])
• IPA^(key): [o̞ːe̞sɨ]

OS(オーエス) • (ōesu) 

1. abbreviation of オペレーティングシステム (operētingu shisutemu, “operating system”): OS
   • 2011 October 21, Hikaru Nakamura, “その45(よんじゅうこ)　八(はっ)百(ぴゃく)万(まん)と九(くゅう)十(じゅう)九(くゅう) [Chapter 45: Eight Million and Ninety-Nine]”, in 聖(セイント)☆おにいさん [Saint☆Young Men], volume 7 (fiction), Tokyo: Kodansha, →ISBN:

     98(くゅうじゅうはち)の次(つぎ)のＯ(オー)Ｓ(エス)は2000(にせん)のはずなのに……このＯ(オー)Ｓ(エス)『99』(くゅうじゅうくゅう)だもん

     Kyūjūhachi no tsugi no ōesu wa nisen no hazu na noni... Kono ōesu “kyūjūkyū” da mon

     The successor OS of 98 is supposed to be 2000... But this OS is ‘99’

Swedish Wikipedia has an article on:

OS

Wikipedia ^sv

OS

1. operating system; initialism of operativsystem
2. an Olympiad (instance of the Olympic Games); initialism of olympiskt spel

   ett OS

   an Olympiad

   ett sommar-OS

   a summer Olympic Games

   ett vinter-OS

   a winter Olympic Games

3. the Olympic Games, the Olympics; initialism of olympiska spelen

   OS i Lillehammer

   the Olympic Games in Lillehammer

   delta i OS

   participate in the Olympic Games

   tävla i OS

   compete in the Olympic Games

   sommar-OS

   summer Olympics

   vinter-OS

   winter Olympics

   OS-elden

   the Olympic flame

   OS-facklan

   the Olympic torch

• OS in Svensk ordbok (SO)
• OS in Svenska Akademiens ordlista (SAOL)

• SO, so