niche market

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Also see: market

Concise Oxford English Dictionary © 2008 Oxford University Press:
niche /niːʃ, nɪtʃ/

▶noun

• 1 a shallow recess, especially one in a wall to display an ornament.

• 2 (one's niche) a comfortable or suitable position in life.

• 3 a specialized but profitable corner of the market.

• 4 Ecology a role taken by a type of organism within its community.

▶verb place in a niche.

– origin C17: from Fr., lit. ‘recess’, from nicher ‘make a nest’, based on L. nidus ‘nest’.