Sesquiduplicate, pronounced /ˌsɛskwɪˈdjuːplɪkeɪt/, is a complex word that describes something that has been replicated one and a half times. The word is spelled using a combination of letters that can be difficult to pronounce at first glance. The prefix sesqui- means one and a half, while -duplicate means copied. Together, they create an unusual but logical spelling. To help with pronunciation, the emphasis falls on the third syllable, and the /kw/ sound is made by combining /k/ and /w/.
The word sesquiduplicate is derived from Latin and is composed of three parts.
1. Sesqui- is a Latin prefix meaning one and a half, or half as much again. It is derived from sesqui- meaning one and a half and -plus meaning more.
2. Duplicate is a Latin word derived from duplicare meaning to double, to increase twofold.
3. The suffix -ate indicates that sesquiduplicate is a verb form.
Putting all parts together, sesquiduplicate means to make one and a half copies or to increase twofold and a half.