Comparison of English dictionaries

Note that the publisher's definition of an entry differs. Some publishers count derivatives as separate entries while others count expressions consisting of more than one word as separate entries. The number of entries is basically a marketing term that should never be used to compare dictionaries.

As an example, the 6th Edition of the Shorter Oxford English Dictionary (SOED6, 2007) contains approximately:

• 104,000 entries (where only the word "back" is listed.)
• 125,000 entries when parts of speech are separately listed ("back" is listed 5 times, 2 times as a noun, as an adjective, as a verb, and also as an adverb.)
• 172,000 entries when derivatives are also counted.
• 600,000 entries when different meanings (12 meanings for the first "back" noun listing alone) and phrases (at the back of, back and edge, behind one's back, etc.) are also counted.

The 2nd Edition of the Oxford English Dictionary (OED) includes more historical entries because it also lists words that have been obsolete for centuries (back to the 7th century) due to changes in meaning and orthography. The Shorter Oxford English Dictionary only covers usage back to the 18th century.

Learner's dictionaries typically contain 40,000 to 50,000 words, which is half to one-third of the current usage, but still claim hundreds of thousands of "entries".

These dictionaries generally aim for extensive coverage of the language for native speakers. They typically only cover one variety of English, either British or American.

These dictionaries generally contain fewer entries (and fewer definitions per entry) than their full-size counterparts but may contain additional material, such as biographical or geopolitical information, that would be useful to a college student. They may be revised more often and thus contain more up to date usage. Sometimes the term collegiate or college is used merely to indicate a physically smaller, more economically printed dictionary.

These dictionaries generally contain fewer entries than full-size or collegiate dictionaries but contain additional information that would be useful to a learner of English, such as more extensive usage notes, example sentences or phrases, collocations, and both British and American pronunciations (sometimes multiple variants of the latter). In addition, definitions are usually restricted to a simpler core vocabulary than that expected of a native speaker. All use the IPA to indicate pronunciation.