Able to be noticed, perceived, or detected through observation or measurement. Capable of being seen or studied.
From Latin 'observabilis', from 'observare' meaning 'to watch, pay attention to', composed of 'ob-' (toward) and 'servare' (to keep, watch). Entered English in the 17th century during the scientific revolution.
In quantum physics, 'observable' has a precise technical meaning - it refers to measurable properties of particles that can be determined through experiments. This scientific precision transformed a simple word about seeing into one of the fundamental concepts of modern physics, where the act of observation itself can change reality.
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