Enterprise is people coming up with new ideas and putting those ideas into action or a business reality?
Enterprise is the factor of production which combines the other factors of production(Land,Labour and Capital) to produce goods/services,bearing the risks involved.The reward for Enterprise is,hopefully,a profit.
Hope this helps.
Enterprise is the human activity which provides the initiative and carries the risk both financial and personal when setting up a business. It is spotting a niche in the market and combining the factors of production (Land, Labour, Capital) to fill that gap in the market for a reward of profit.
e.g Mark Zuckerberg showed enterprise when he set up Facebook, a social networking site.