I was curious whether a clear-cut definition of order of magnitude for a number exists.
I have seen several posts in this forum touching upon, or tapping from, the concept of order of magnitude. None seemed (to me) to address the definition, though; for example Order of Magnitude, What does "within the same order of magnitude" convey?, Order of magnitude of a variable..
The ideal answer should assist the naive user in discriminating whether 50.1, or 99, should be of order 10 rather than order 100, for example. Or, at least, show why a clear-cut answer does not exist.