A master dictionary or glossary is updated at a server, and the update to the master dictionary or glossary is served to the application on the client to update a local copy of the dictionary or glossary. A datastream may also be processed by automatically scanning a datastream and automatically detecting, in the datastream, a word that cannot be matched to a word in a dictionary or glossary. The unmatched word is identified as an acronym, and in response, data associated with the acronym, selected from a hierarchical set of glossaries, is inserted into the datastream in close proximity to the acronym. In another aspect of processing a datastream, in response to an indication that the unmatched word is a properly spelled new term, a dictionary or glossary may be updated with the new term.