Grade 5 niche Get Printable Handwriting (niche) 1 syllables Learn It! Spelling Test Definition noun. a hollow place set into a wall to hold a statue or some other object; Ecology. the position or function in an ecoystem Example Sentence He found his niche. OR The hummingbird's niche is to gather nectar. Synonyms job; alcove; nook; recess Antonyms opposite of niche Share with your friends: