GNU Webster's 1913 - adj. a species of orthographic projection,
in which but a single plane of projection is used. It is so
named from the fact that the projections of three equal lines,
parallel respectively to three rectangular axes, are equal to
one another. This kind of projection is principally used in
delineating buildings or machinery, in which the principal lines
are parallel to three rectangular axes, and the principal planes
are parallel to three rectangular planes passing through the
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