Physical:To 'smart' means to sting or hurt.
Intellectual: The word usually refers to use of intelligence in various contexts. It's a descriptor, but can be used as an individual, unqualified word meaning clever.
Verb:To do something 'smartly' or 'quick smart' means to do it quickly and well.
Idiomatic: The word is used referring to products and implies advanced technology, 'smart' products, derived from the intellectual meaning.
Examples of Smart:http://www.hr.ecu.edu.au/mps/html/mps-smart.cfm#smart