Definition of less adverb from the Oxford Advanced Learner's Dictionary

  

less

 adverb
adverb
BrE BrE//les//
 
; NAmE NAmE//les//
 
 
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  •  to a smaller degree; not so much less expensive/likely/intelligent less often/enthusiastically I read much less now than I used to. The receptionist was less than (= not at all) helpful. She wasn't any the less happy for (= she was perfectly happy) being on her own. That this is a positive stereotype makes it no less a stereotype, and therefore unacceptable.
  • Word Origin Old English lǣssa, of Germanic origin; related to Old Frisian lēssa, from an Indo-European root shared by Greek loisthos ‘last’.Idioms  and certainly not No explanation was offered, still less an apology. He’s too shy to ask a stranger the time, much less speak to a room full of people.  continuing to become smaller in amount She found the job less and less attractive.
    1. 1  almost I've more or less finished the book. more or lessalmost
    2. 2  approximately She could earn $200 a night, more or less.
    See the Oxford Advanced American Dictionary entry: less