Bible Dictionaries
Duplex

Webster's Dictionary

(1):

(a.) To arrange, as a telegraph line, so that two messages may be transmitted simultaneously; to equip with a duplex telegraphic outfit.

(2):

(a.) Double; twofold.

Bibliography Information
Webster, Noah. Entry for 'Duplex'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​d/duplex.html. 1828.