small
I
 /ˈsmɑːl/  adj  , small·er, -est [also more ~; most ~]
  1 : little in size
   They live in a small house.
   a small glass of soda
   She moved to a smaller town.
   The toy is small enough to fit in my pocket.
   He has small hands.
   This room is a little smaller than that one.
  2 : few in number or little in amount
   a small crowd/group/company/party/school
   a small supply/number
   The movie was a small success.
   There is a small [=slight] chance that they can still win.
  — see also small hours at hour
  3 : not very important : minor
   a small matter
   There are still a few small details we have to deal with.
   It's only a small mistake.
   The change had only a small impact on the community.
  4 : very young
   I loved the playground when I was small.
   a small boy
   They have two small children.
  5 : involving or including few people, things, etc.
   She works for a small company.
   small businesses/dealers/investors
   a small advertising campaign
   a small fund-raiser
  6 : lowercase
   The first letter is a capital, but the rest are small.
  7 : very soft and quiet
   a small voice
  8 : foolish or ashamed
   He's just trying to make you feel small.
   He felt very small to be caught cheating.
  a big fish in a small pond — see fish, 1
  in no small measure
   : to a great degree : largely or mostly
    A child's happiness is due in no small measure [=in no small part] to its parents.
  (it's a) small world — see world, 1
  not (in) the smallest bit — see bit, 1
  small·ish /ˈsmɑːlıʃ/  adj  
  small·ness /ˈsmɑːlnəs/  noun   [  noncount  ]
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II
  noun  ,  pl   smalls [  count  ]
  : something that is sold in a small size : something that is smaller than other things of the same kind
   These shirts are all smalls.
   “What size ice-cream cones do you want?” “We'll take three larges and a small.”
  the small of the/your back
   : the lower part of your back that is smaller and narrower than the rest
    I felt a sharp pain in the small of my back.