Definition of: catchword

(kach′wûrd′) noun
1. A word or phrase to catch the popular fancy or attention, especially, a word or phrase used as a slogan in a political campaign.
2. In the theater, a cue.
3. A word so placed as to catch the attention.
4. An isolated word at the bottom of a page in old books, inserted to connect the text with the beginning of the next page.
5. A word at the head of a page or column, as of a dictionary, encyclopedia, etc.