contrapositive

DICTIONARY OF TOMORROW Two words not listed at Dictionary.com:

1) Scratchiti. Defined by UrbanDictionary.com as, "a form of graffiti in which markings are etched into hard surfaces. Particularly prevalent in NYC Subways." (Read more about scratchiti here.)

2) Spim. Defined by The Word Spy as, "unsolicited commercial messages sent via an instant messaging system." (A good article on the spim phenomenon can be found here.)