Prefix
1. New. (wiktionary.org)
2. (Organic chemistry) Having a structure, similar to that of neopentane, in which each hydrogen atom of a methyl group has been replaced by an alkyl group. (wiktionary.org)
3. A new or revived form of. (Google Dictionary)
Prefix origin: From Greek neo-, comb. form of neos “new, young, youthful; fresh, strange; lately, just now.”