Collins Dictionary (Collins Dictionary is a print and online English dictionary created by the HarperCollins Group in the United Kingdom. It is one of the best dictionaries in the hearts of readers around the world and is known as "the most comprehensive and authoritative guide to modern English".

Collins Online Dictionary was developed over 18 months by a team of editors from Collins headquarters. It took 18 months to develop and was released on December 31, 2011. On the day of its release, Collins Online Dictionary included 120,000 definitions, each containing information on interpretation, derivation, etymology, etc. The dictionary cites a total of 2 million authoritative example sentences, and the number of entries is still growing steadily.

All of Collins' dictionary resources come from Collins' unique language database (known as Collins Word Web), which collects more than 1 billion words and phrases used in books, newspapers, radio, television, magazines, letters, or speeches. The database contains more than 1 billion words and examples of how they have been used in books, newspapers, radio, television, magazines, letters, or speeches, and accurately expresses the meaning of the English words people use today.