WordReference Random House Learner's Dictionary of American English © 2014
smart /smɑrt/USA pronunciation v., -er, -est,adv., n. 
v. [no object] to be a cause of sharp, stinging pain:The cut on his arm still smarted. to suffer sharply, as from wounded feelings:still smarting from the insults.
adj.  having or showing quick intelligence or ready mental capability:a smart student.[It + be + ~ + to + verb]It wasn't very smart of you to try to cheat. shrewd or sharp, as a person in dealing with others:a smart campaigner. clever or witty, as a speaker or speech. neat or trim in appearance, as a person or garment; spruce:a very smart outfit. socially elegant;
sophisticated or fashionable:the smart crowd.
saucy; pert:Keep your smart remarks to yourself. brisk or vigorous:to walk with smart steps. sharply severe, as a blow; sharp or keen:a smart pain;
a smart slap on the arm.
[often before a noun] equipped with, using, or containing electronic control devices:smart bombs. Computing[Computers.]intelligent (def. 3).intelligent
adv.  in a smart manner; smartly.
n.  [countable;
usually: a + ~]
a sharp local pain.
smarts, [uncountable;
used with a singular verb]
common sense:has a lot of smarts.
smart•ly, adv.: to dress smartly; She rapped smartly on the door.
smart•ness, n. [uncountable]

Collins Concise English Dictionary © HarperCollins Publishers::

smart /smɑːt/ adj
  1. astute, as in business; clever or bright
  2. quick, witty, and often impertinent in speech: a smart talker
  3. fashionable; chic: a smart hotel
  4. well-kept; neat
  5. causing a sharp stinging pain
  6. vigorous or brisk
  7. (of systems) operating as if by human intelligence by using automatic computer control
  8. (of a projectile or bomb) containing a device that allows it to be guided to its target
vb (mainly intr)
  1. to feel, cause, or be the source of a sharp stinging physical pain or keen mental distress: a nettle sting smarts, he smarted under their abuse
  2. (often followed by for) to suffer a harsh penalty
  1. a stinging pain or feeling
  1. in a smart manner
Etymology: Old English smeortan; related to Old High German smerzan, Latin mordēre to bite, Greek smerdnos terrible

ˈsmartly adv ˈsmartness n

Smart /smɑːt/ n
  1. Christopher. 1722–71, British poet, author of A Song to David (1763) and Jubilate Agno (written 1758–63, published 1939). He was confined (1756–63) for religious mania and died in a debtors' prison

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