double-digit 
adjective
(Of a number or variable) between 10 and 99.Firms with questionable numbers see their stock prices fall by double-digit percentages....
- He expects earnings to grow by double-digit figures in the first half of the current financial year.
- For several years in a row, the retail costs of heating oil and natural gas have seen double-digit percentage increases.
noun (double digits) North American
another term for double figures.Unemployment in the high-tech sector remains stubbornly in double digits....
- He won't reveal the fund's returns, saying only that they've averaged in the double digits since its launch in 2000.
- Unemployment that should hover around 5-6 per cent gradually moves to double digits.