by eye

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English[edit]

Prepositional phrase[edit]

by eye

  1. By estimation, based on a visual inspection, without accurate measurement.
    • 1984, Andrew Barker, Greek Musical Writings: Volume 2, Harmonic and Acoustic Theory, page 277:
      Thus given a straight line it is very easy to construct a smaller or a greater than it by eye, not just because this is a broad sort of distinction, but because it also involves only one comparison.