observational
ob·ser·va·tional
adjective
1.
relying on observation or experiment
- “experimental results that supported the hypothesis”
Origin
From observation + -al.
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.