Longman Dictionary of Contemporary English - experimentally

~ adv 1 in a way that is connected with experiments  (data obtained experimentally) 2 in a way that involves using new ideas or methods  (The Americans experimentally exploded the first nuclear weapon in the history of mankind.) 3 if you do something experimentally you do it in order to see or feel what something is like  (He ran his fingers experimentally over the animal's back.)