OS

proper noun

1. 1

   Variant of Owen SoundInitialism of Owen Sound.

2. 2

   Variant of The Ordnance SurveyInitialism of The Ordnance Survey, official mapping agency in Great Britain (see also the noun below).

3. 3

   Variant of Old SaxonInitialism of Old Saxon.

adjective

1. 1

   Variant of outsizeInitialism of outsize, clothes for large people.

2. 2

   Variant of oversizeInitialism of oversize.

3. 3

   Variant of Old StyleInitialism 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. 4

   Variant of offscreenAbbreviation of offscreen, indicating a line of dialogue is spoken by someone not visible onscreen.

5. 5

   Variant of over shoulderInitialism of over shoulder.

adverb

1. 1

   Variant of overseasinformalInitialism of overseas.

   You did the overseas trip. You went OS.

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

noun

1. 1

   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. 2

   Variant of operating systemInitialism of operating system.

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

   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 […]

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

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

3. 3

   Variant of ordinary seamanInitialism of ordinary seaman.

4. 4

   Variant of oppidan scholarInitialism of oppidan scholar.

Forms

plural

OSes, OSs, OS's