What does OS stand for?
OS stands for Old Style (or Old System; referring to Julian Calendars)
This definition appears very frequently and is found in the following Acronym Finder categories:
- Science, medicine, engineering, etc.
See other definitions of OS
We have 53 other meanings of OS in our Acronym Attic
- Ogawa Shigeo (Engines)
- Oh Shoot (polite form)
- Ohr Somayach (school)
- Oil Separator
- Old Saxon
- Old School
- Old Silcoatian (Silcoates School, Wakefield, UK)
- Old Spice (after shave brand)
- Old Stuff :-)
- Old Style