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English thesaurus
observation ['ɔbzə'veɪʃ(ə)n] abbr.
abbr.	obbo; observ; obsv
abbr., mil.	obsn; obsr
mil., logist.	The condition of weather and terrain that permits a force to see the friendly, enemy, and neutral personnel and systems, and key aspects of the environment. (FRA)

Observation: 3 phrases in 1 subject

Mathematics

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