it mean drought area
sub set is set
not a sub set
The definition of the prefix sub is: Under or less than.
the middle of a unversal set
A switch subservient to the main switch, possibly on a sub-panel.
Sub-zero means less than zero. Usually referring to temperature.
If a set has numbers 1 to 10, then a sub-set is any number or a group of numbers within the range of the set earlier mentioned. Hence numbers 1 to 5 or 3, 4. 6, 9 or any such arrangement within the range of the Set, is a sub-set.
The set contained in another set is termed as a sub-set.
That seems to be a reasonable definition.
Sub-transmission substations are located near to high load concentrations, usually in urban areas.
Taluk is a sub-division of a district in South Asia
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