(all of the enhanced units present parts of speeches (when applicable), have definitions for word entries, and clarifying sentences in context)

(bibliographic sources of information from which words and topics have been compiled about scientific and technological topics)

(bibliographic sources of information from which words and sentences have been compiled about words and expressions English speakers should know for better understanding and communication)

(there are many words which may be rarely seen by a vast number of people; however, they have been existing and they are still available for one's use or enlightenment)

(a collection of English words that have been used in the titles of articles from various printed media)