Synonyms

Syntax: choose from drop-down list

This allows you to select a level of equivalence matching. You can limit results to specific matches, or you can allow synonyms and phrases. The values are described as follows:

Disabled: no phrase recognition and no synonyms (equivalences). Only searches for the the actual terms in a query. This is regardless of ~ usage.

Phrase recognition only: recognize query word groups that are known phrases and search for them as phrases.

Phrases & Allow synonyms: phrase recognition plus allows the tilde ( ) operator to match synonyms on specific query terms

Phrases & Use synonyms by default: phrase recognition and matching synonyms on all query terms (tilde to turn off on specific terms).

See also Using the Thesaurus (section 6.3).