Hebrew calendar, Jewish calendar - (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

Lag b'Omer - (Judaism) Jewish holy day; the 33rd day after the 2nd day of Passover; the 18th day of Iyar

Jewish calendar month - a month in the Jewish calendar