from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Slang One that is new to something, especially a novice at using computer technology or the Internet.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A new user or participant; someone who is extremely new and inexperienced (to a game or activity). A beginner.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. any new participant in some activity
From new (with b as in freebie).(American Heritage® Dictionary of the English Language, Fourth Edition)
Origin uncertain: perhaps an alteration of newie with intrusive B (compare freebie), perhaps a shortening of new boy or new beginner. Very likely originated in Newfoundland, where the term 'new boy' is quite common, and sounds like 'newbie' when spoken. (Wiktionary)