Crossword Clue:

TRIGLOT a book written in three languages

AnswerCrossword Clue
ETCAbbr. sometimes written three times in a row
DIGLOTSBooks written in two languages.
RHOWhen written three times, fraternity in "Revenge of the Nerds"
AUTOBIOGRAPHYBook written in first person
TEENSHarry Potter and friends, in book three