Webster's English Dictionary

Enter the word to look up:

duplex

1. du.plex \'d(y)u:-.pleks\ aj [L, fr. duo two + -plex -fold - more at TWO, 
   SIMPLE] 1: DOUBLE, TWOFOLD; specif : having two parts that ope rate at the 
   same time or in the same way {a ~ lathe} 2: allowing telecommunication in 
   opposite directions simultaneously 
2. duplex n : something duplex; esp : a two-family house