Longman Dictionary of Contemporary English
Wiktionary
n. An orchestra of modest size, to play chamber music, yet larger than the various chamber ensembles named after their number of instruments (from duo to nonet)
WordNet
n. small orchestra; usually plays classical music
Usage examples of "chamber orchestra".
Andreno ran into a food-service supervisor that he knew, and asked about the chamber orchestra event.
He'd already been out there once before tonight, but that had been with the chamber orchestra, and there'd been safety in numbers.
Instead Pazzi, still rapt from the sight of the money, had to leap into his dinner clothes and meet his wife at a long-anticipated concert of the Florence Chamber Orchestra.
Like the one you were telling me about a few weeks back, with that chamber orchestra?
Behind them, the dancers whirled to the strains of a chamber orchestra.
And Cinnabar talked on, whistled on, and on, dinner music, a one-creature chamber orchestra, sweet background music for the downy diners of Survival.
Inside, I found a glossy brochure full of architects' drawings of happy, slender people strolling around among handsome houses, listening to a chamber orchestra in the room where I formerly watched movies in the company of twitching lunatics, or swimming in an indoor pool sunk into the floor of the great Gothic hall where I had once played badminton and falteringly asked the young nurse from Florence Nightingale for a date, with a distant view, if she could possibly spare the time, of marrying me.