= Dimension
{disambiguate=system of units}
A dimension in a <system of units> is something like <length>, <weight> or <time>, without considering how to assign numerical values ot them, which requires <units of measurement> such as the <meter>, <kilogram> or <second>.
Talking about dimensions can be useful when explaining new derived units without worrying about the exact units involved. See e.g. this table: https://en.wikipedia.org/w/index.php?title=Lumen_(unit)&oldid=1233810964#SI_photometric_units
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