Meaning of 'resolution' in regression I'm reading a paper and wonder what 'resolution' mean in this context.

To speed the regression process, we use scale factors to quantize each
of these variables as integers. The resolution of variable 1 (Time)
is one second. The resolution of the dimensionless variable 2 is 0.1. The resolution of variable 3 (Altitude) is 200 ft.

Does resolution mean 'unit' in this context?

It means that you can tell when objects are separated by $200$ feet of altitude. If they are separated by $201$ feet, they appear to have different altitudes. If they are separated by $199$ feet, they do not.
This terminology is common in sciences that use microscopes (telescopes, too). A microscope that can distinguish features that are a nanometer apart lets you see more detail than your naked eye that can distinguish features that are millimeters or perhaps centimeters apart. You might get a better sense of how this works by reading about microscopes, since it turns out that there’s really nothing statistical about this issue.
