Multi-field dictionary
Encyclopedia
A multi-field dictionary is a specialized dictionary
Specialized dictionary
A specialized dictionary is a dictionary that covers a relatively restricted set of phenomena. The definitive book on the subject includes chapters on dictionaries of:*synonyms*pronunciations*names...

 that has been designed and compiled to cover the terms within two or more subject fields. Multi-field dictionaries should be contrasted with single-field dictionaries
Single-field dictionary
A single-field dictionary is a specialized dictionary that has been designed and compiled to cover the terms of one particular subject field. Single-field dictionaries should be contrasted with multi-field dictionaries and sub-field dictionaries....

 and sub-field dictionaries
Sub-field dictionary
A sub-field dictionary is a specialized dictionary that has been designed and compiled to cover the terms of one sub-fields of a particular subject field. It is therefore a sub-division of the class of dictionary called a single-field dictionary...

.

The typology consisting of these three dictionaries is important for a number of reasons. First of all, a multi-field dictionary is an example of the ordinary technical dictionary, covering a large number of separate subject fields, e.g. banking, economics, finance, insurance and marketing.

The main problem with multi-field dictionaries is that they tend to cover one or two subjects extensively, whereas the vast majority of subject are only represented by a very limited number of terms.

Secondly, the typical multi-field dictionary tends to be a minimizing dictionary, i.e. it covers only a limited number of terms within the subjects covered.

Thirdly, if the lexicographers intend to make a bilingual, maximizing multi-field dictionary they run into problems with the large amount of data that has to be included in the dictionary.

Consequently, the best coverage of linguistic and extra-linguistic aspects within the subject field covered by a dictionary will be found in a single-field dictionary
Single-field dictionary
A single-field dictionary is a specialized dictionary that has been designed and compiled to cover the terms of one particular subject field. Single-field dictionaries should be contrasted with multi-field dictionaries and sub-field dictionaries....

.

Relevant literature

Sandro Nielsen: "Contrastive Description of Dictionaries Covering LSP Communication". In: Fachsprache/International Journal of LSP 3-4/1990, 129-136.
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