The Collaborative International Dictionary of English v.0.48:

Hebrew calendar \Hebrew calendar\
   same as Jewish calendar.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

Hebrew calendar
    n 1: (Judaism) the calendar used by the Jews; dates from 3761 BC
         (the assumed date of the Creation of the world); a lunar
         year of 354 days is adjusted to the solar year by periodic
         leap years [syn: Jewish calendar, Hebrew calendar]