Editing Astrophysics Data System (section)

===Synonym replacement===
Once search terms have been preprocessed, the database is queried with the revised search term, as well as synonyms for it. As well as simple [[synonym]] replacement such as searching for both [[plural]] and [[Grammatical number|singular]] forms, ADS also searches for a large number of specifically astronomical synonyms. For example, [[spectrograph]] and [[spectroscope]] have basically the same meaning, and in an astronomical context [[metallicity]] and [[Abundance of the chemical elements|abundance]] are also synonymous. ADS's synonym list was created manually, by grouping the list of words in the database according to similar meanings.<ref name="architecture"/>

As well as [[English language]] synonyms, ADS also searches for English translations of foreign search terms and vice versa, so that a search for the [[French language|French]] word ''soleil'' retrieves references to [[Sun]], and papers in languages other than English can be returned by English search terms.

Synonym replacement can be disabled if required, so that a rare term which is a synonym of a much more common term (such as '[[dateline]]' rather than '[[calendar date|date]]') can be searched for specifically.