observational

[ob-zur-vey-shuh-nl]
adjective
of, pertaining to, or founded on observation, especially founded on observation rather than experiment.

Origin:
1825–35; observation + -al1

observationally, adverb
nonobservational, adjective
preobservational, adjective
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World English Dictionary
observation (ˌɒbzəˈveɪʃən)
 
n
1.  the act of observing or the state of being observed
2.  a comment or remark
3.  detailed examination of phenomena prior to analysis, diagnosis, or interpretation: the patient was under observation
4.  the facts learned from observing
5.  an obsolete word for observance
6.  nautical
 a.  a sight taken with an instrument to determine the position of an observer relative to that of a given heavenly body
 b.  the data so taken
 
obser'vational
 
adj
 
obser'vationally
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
After the hour is up, they write a reflection on that solitary, observational
  experience.
Much of life seemed to happen at a kind of observational remove from him.
The research will use publicly available data and will begin with observational
  studies to establish baseline normative behaviors.
One of my favorite techniques is to use observational work.
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