OS

Proper noun

OS

1. (sports) Abbreviation of Owen Sound.

Adjective

OS (not comparable)

1. outsize (clothes for large people)
2. 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

Initialism

OS (plural OSes or OSs)

1. (Britain) an Ordnance Survey map.

   We've got an OS of the Cuckmere area.

2. (software) 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).

Anagrams

• S&O, SO, So, So., s.o., s/o, so

Noun

OS (plural OS-ek)

1. (computing) Abbreviation of operating system.

Etymology

From English OS.

Pronunciation

• (Tokyo) オーエ​ス [òóéꜜsù] (Nakadaka – [3])
• IPA^(key): [o̞ːe̞sɨᵝ]

Noun

OS (katakana オーエス, rōmaji ōesu)

1. Initialism of オペレーティングシステム (operētingu shisutemu); an OS
   • 2011 October 21, Nakamura, Hikaru, “その45　八百万と九十九 [Chapter 45: 8,000,000 and 99]”, in 聖セイント☆おにいさん [Saint☆Young Men], volume 7 (fiction, in Japanese), Tokyo: Kodansha, →ISBN:

     98の次のＯＳは2000のはずなのに……このＯＳ『99』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’

Noun

OS

1. (Can we verify⁽⁺⁾ this sense?) oculus sinister — left eye

Initialism

OS

1. operating system; Abbreviation of operativsystem.
2. the Olympic Games; Abbreviation of olympiska spelen.