Related formsob·ser·va·tion·al·ly, adverbnon·ob·ser·va·tion·al, adjectivepre·ob·ser·va·tion·al, adjective
Examples from the Web for observational
When a scientific truth arises, it is so because of observational and experimental consensus.
Meanwhile, some of the observational studies don't even show any benefit from insurance.Study: Giving People Government Health Insurance May Not Make them Any Healthier|Megan McArdle|May 1, 2013|DAILY BEAST
In both stories, the detached, observational voice calmly belies the impossibility of ever keeping a job ‘strictly business.’
All the lurking about unnoticed has allowed her to sharpen her observational skills.
Observational astronomy, meanwhile, was advancing to Descriptive and practical astronomy.
He was hardly a practical astronomer in the observational sense.Kepler|Walter W. Bryant
Even so with truth in observational science: it is built up of trifles patiently gathered together.The Life of the Spider|J. Henri Fabre
For the most part it has been an observational rather than an experimental study.Mimicry in Butterflies|Reginald Crundall Punnett
This first and oldest branch is known as "observational," or "practical astronomy."A Popular History of Astronomy During the Nineteenth Century|Agnes M. (Agnes Mary) Clerke