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main  (mains plural )
1  adj The main thing is the most important one of several similar things in a particular situation.  (=chief) 
...one of the main tourist areas of Amsterdam...  
2 If you say that something is true in the main, you mean that it is generally true, although there may be exceptions. 
in the main  phrase  (=on the whole) 
Tourists are, in the main, sympathetic people...  
3  n-count The mains are the pipes which supply gas or water to buildings, or which take sewage away from them. 
...the water supply from the mains...  
4  n-plural The mains are the wires which supply electricity to buildings, or the place where the wires end inside the building. 
 (mainly BRIT) 
...amplifiers which plug into the mains...