niche (niche), n. [Fr. niche, from L. nidus, a nest.]

1. A recess or hollow in a wall, usually intended for a statue, bust, or vase.
2. A situation or activity specially suited to a person's interests, abilities, or nature.
3. A special area of demand for a product or service.
4. The function or position of an organism or population within an ecological community.
5. The particular area within a habitat occupied by an organism.