from The American Heritage® Dictionary of the English Language, 4th Edition
- All: omnidirectional.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- a combining form meaning "all", used in the formation of compound words.
from the GNU version of the Collaborative International Dictionary of English
- A combining form denoting all, every, everywhere.
Latin, from omnis, all; see op- in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin omnis "all" (Wiktionary)