Observation
An Illustrated Dictionary of Medicine, Biology and Allied Sciences · 1907 · p. 32
(ob-zer-vaf -shun). The examination of a thing; a systematic study of phenomena.
Bu kavram başka kaynaklarda da geçiyor
French-English Dictionary of Military Terms (1918)
French-English and English-French Commercial Dictionary (1918)
Nuttall's Standard Dictionary of the English Language (1890)
Illustrated Marine Encyclopedia (1890)
Zell's Condensed Dictionary (1879)
A Military Dictionary (1810)
The American Dictionary and Cyclopedia
balloon-observation
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A Dictionary of Aviation (1911)
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