''In situ'' ( or ; often not italicized in English) is a Latin phrase that translates literally to "on site"〔(Lewis & Short Latin Dictionary )〕 or "in position".〔Collins Latin Dictionary & Grammar〕 It means "locally", "on site", "on the premises" or "in place" to describe an event where it takes place, and is used in many different contexts. For example, in fields such as physics, chemistry, or biology, ''in situ'' may describe the way a measurement is taken, that is, in the same place the phenomenon is occurring without isolating it from other systems or altering the original conditions of the test.
In the aerospace industry, equipment on-board aircraft must be tested ''in situ'', or in place, to confirm everything functions properly as a system. Individually, each piece may work but interference from nearby equipment may create unanticipated problems. Special test equipment is available for this ''in situ'' testing.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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