Longman Dictionary of Contemporary English
WordNet
n. a region resembling a laboratory inasmuch as it offers opportunities for observation and practice and experimentation; "the new nation is a testing ground for socioeconomic theories"; "Pakistan is a laboratory for studying the use of American troops to combat terrorism" [syn: laboratory]
Usage examples of "testing ground".
This whole planet is no more than a vast experimental laboratory for you, a testing ground for your pet theories.
The new routines and commands needed to be tested, so Xerxes had allowed his planet to be used as a testing ground.
Han and Chewie stop at a bar to feel out exactly what Lando is up to - which is as a testing ground to find better ways to mine asteroids.
We had pleasure worlds, in my day, but they were places you went to test your mettle and your courage, a testing ground where you could grow sharper and stronger.
There'd been more new weapons adapted from his kit, and he'd realized the courtyard was merely Jedrik's testing ground, that there must be many more training areas for her followers.