/ niːʃ; nɪtʃ; NAmE nɪtʃ; niːʃ/ noun
1.
a comfortable or suitable role, job, way of life, etc. :
He eventually found his niche in sports journalism.
2.
( business ) an opportunity to sell a particular product to a particular group of people :
They spotted a niche in the market, with no serious competition.
a niche market
the development of niche marketing (= aiming products at particular groups)
3.
a small hollow place, especially in a wall to contain a statue, etc., or in the side of a hill
SYN nook
4.
( biology ) the conditions of its environment within which a particular type of living thing can live successfully
••
WORD ORIGIN
early 17th cent.: from French , literally recess, from nicher make a nest, based on Latin nidus nest.