Longman Dictionary of Contemporary English
Wiktionary
n. (context of a number English) composed of two digits, i.e. between 10 and 99.
Usage examples of "double digits".
From zero to double digits in how long-forty-eight, seventy-two hours?
Because of the number of people who believed that Sweigel had cured Cozzano, his numbers were now climbing up into double digits, and he was starting to become a major annoyance to McLane.
I think it's fair to say that under many of these scenarios, you guys would be growing in double digits for much of the next decade, if not longer.
Four short furry legs supported it, ending in thick, double digits.
F-80s, '84s, 94s, really anything in the double digits was slow, buitt before the sound barrier was broken.
How well I knew that his priorities were work first, second and third, with Cecilia somewhere in the double digits.