The Ordnance Survey, official mapping agency in Great Britain (see also the noun below).
3
Initialism of Old Saxon.
adj
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
Abbreviation of offscreen, indicating a line of dialogue is spoken by someone not visible onscreen.
5
Initialism of over shoulder.
adv
1
Initialism of overseas.
You did the overseas trip. You went OS.
I kind of expanded my circle a bit more when I went OS [overseas].
Thesaurus
Synonyms
noun — rigid connective tissue that makes up the skeleton of verteb
I kind of expanded my circle a bit more when I went OS [overseas].
Wiktionary
03
We've got an OS of the Cuckmere area.
Wiktionary
04
Calton Hill in Edinburgh is located at OS grid ref NT262741.
Wiktionary
05
I've decided to install two different OSes on my new laptop.
Wiktionary
06
I was once, I remember, called to a Patient, who had received a violent Contuſion in his Tibia, by which the exterior Cutis was lacerated, ſo that there was a profuſe ſanguinary Diſcharge; and the int
Wiktionary
Usage Notes
i Register
In some senses, os is marked as informal, UK, rare. Watch for register when choosing this word.