Words mean different things to different people.
A technical language is developed so that the members of the community can communicate more efficiently and precisely with each other. Unfortunately, outsiders will have great difficulty in understanding what is being said. To overcome this problem, technical dictionaries and glossaries have been written, e.g. the EPSS glossary. These dictionaries and glossaries are useful for reference but their functionality will be enhanced if they are available as an online help. For example, if you are reading a technical article and you are not familiar with the subject, wouldn't it be nice if you can highlight any word or phrase, select your glossary and an explanation of the word or phrase appear.