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A multi-field dictionary is a specialized dictionary 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 and sub-field dictionaries.
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.
Sandro Nielsen: "Contrastive Description of Dictionaries Covering LSP Communication". In: Fachsprache/International Journal of LSP 3-4/1990, 129-136.