[count] 1 : a job, activity, etc., that is very suitable for someone
▪ I found a niche for myself after high school. ▪ She finally found her niche as a teacher.2 : the situation in which a business's products or services can succeed by being sold to a particular kind or group of people — usually singular ▪ They're still trying to find their niche in the market/industry. ▪ This product fills a niche in the market. = This product fills a market niche. [=provides something that certain kinds of people want to buy] — often used before another noun ▪ Teenage girls are our niche market. [=are the people we can sell our products to] ▪ niche products/publications [=products/publications that appeal to a particular kind or group of people]3 technical : an environment that has all the things that a particular plant or animal needs in order to live
▪ the species that fill an environmental/ecological niche4 : a curved space in a wall that is designed to hold a statue, vase, etc.
▪ I found a niche for myself after high school. ▪ She finally found her niche as a teacher.
▪ the species that fill an environmental/ecological niche