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==Origin==
==Origin==
[[Latin]] ''apertūra'', < apert- participial stem of ''aperīre'' to open
[[Latin]] ''apertūra'', < apert- participial stem of ''aperīre'' to open
*[http://en.wikipedia.org/wiki/17th_century 17th Century]]
*[http://en.wikipedia.org/wiki/17th_century 17th Century]
==Definitions==
==Definitions==
*1: the process of opening
*1: the process of opening