Longman Dictionary of Contemporary English. Got it!
Online. Oxford Dictionaries - Dictionary, Thesaurus, & Grammar. Longman Business English Dictionary 7 on the App Store. Longman Dictionary of Contemporary English- 6th Ed on the App Store. Collins Dictionary.
Wolfram Words Reference App on the App Store. Wordnik. Dictionary, Encyclopedia and Thesaurus - The Free Dictionary. Free English Dictionary and Thesaurus Online. Free Online Collocations Dictionary. Comparison of English dictionaries. These tables compare modern and notable English dictionaries, split by market segment.
Unless noted after the edition number, all are single-volume works. Number of entries Note that the publisher's definition of an entry differs.