The word 'convertend' is not commonly used, but it refers to a mathematical term in a conversion equation. The IPA phonetic transcription for this word is /kənˈvərtənd/. The spelling of this word reflects the pronunciation, with the stress on the second syllable and a schwa sound in the third syllable. It is derived from the Latin word 'con vertendus', which means "to be converted." Its usage in mathematics is to indicate the value that we wish to convert.