The Macquarie Dictionary Online gives you access to the Macquarie Dictionary Sixth Edition (published in October 2013), annual updates of new words, along with its companion reference the Macquarie Thesaurus.
The Macquarie Dictionary & Thesaurus Online features the following:
* the complete record of English as it is used in Australia, from the colourfully colloquial to the highly technical
* words and phrases from regional Australia, many gathered from Australian Word Map, a joint online project of Macquarie and ABC Online
* easy, comprehensive and interactive searching of over 138,000 headwords and phrases and over 210,000 definitions, with the ability to search either the dictionary, thesaurus or both