nWide-coverage English dictionary
nExtensive lexical, concept (word sense) inventory
nSyncategorematic information (frames etc.)
nPrincipled organization
nHierarchical relations with links between concepts
nDifferent structures for different parts of speech
nHand-checked for reliability
nUtility
nDesigned to be used with other systems
nMachine-readable database
nUsed as a base/standard by many researchers