the quality or state of being total or complete; all of something considered as a whole; or the period during a total eclipse when the sun is completely blocked.
From Latin 'totalis' meaning 'of the whole,' combined with '-ity' suffix. Root comes from 'totus' (whole). The eclipse meaning is a specialized astronomical use.
The 'path of totality' during a solar eclipse is a geographical line only about 100 miles wide, yet people will travel thousands of miles to stand in it for just a few minutes of cosmic magic.
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