Niche (?), n. [F., fr. It. nicchia, prop., a shell-like recess in a wall, fr. nicchio a shellfish, mussel, fr. L. mytilus.] A cavity, hollow, or recess, generally within the thickness of a wall, for a statue, bust, or other erect ornament. hence, any similar position, literal or figurative.Images defended from the injuries of the weather by niches of stone wherein they are placed.Evelun.
The noun Niche has 4 senses
1. niche -- a position particularly well suited to the person who occupies it; "he found his niche in the academic world"
2. recess, niche -- an enclosure that is set back or indented
3. recess, recession, niche, corner -- a small concavity
4. niche, ecological_niche -- (ecology) the status of an organism within its environment and community (affecting its survival as a species)