Meaning of “smart” - Learner’s Dictionary

smart

adjective uk us /smɑːt/
INTELLIGENT

B1 intelligent:

Rachel's one of the smartest kids in the class.
TIDY

B1 If you look smart or your clothes are smart, you look clean and tidy:

a smart, blue suit
I need to look a bit smarter for my interview.
FASHIONABLE
MACHINE/WEAPON

A smart machine, weapon, etc uses advanced computer systems:

smart bombs
smartly adverb

(Definition of “smart adjective” from the Cambridge Learner’s Dictionary © Cambridge University Press)