Observation
French-English and English-French Commercial Dictionary · 1918 · p. 140
n.f., observance; remark; observation; fulfilment.
Bu kavram başka kaynaklarda da geçiyor
French-English Dictionary of Military Terms (1918)
An Illustrated Dictionary of Medicine, Biology and Allied Sciences (1907)
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
—
A Dictionary of Aviation (1911)
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