I am familiar with a Passover seder, but what is a Tu BiShvat seder?
Tu BiShvat (Hebrew for the 15th day of the Hebrew month of Shvat) is the new year of the trees.
Why do we celebrate Tu BiShvat, the Jewish “New Year of the Trees,” in the middle of winter?
Tu BiShvat, called the "New Year of the Trees," falls at a seemingly incongruous time of year.
S’firat HaOmer
"Counting of the omer;" An omer is a biblical measurement of grain. The counting of the omer is 49-day period that begins on the second night of Passover during which each day is counted with a blessing. On the 50th day, the Festival of Shavuot is observed.
Tikkun Leil Shavuot
A celebration specific to the holiday of Shavuot, it includes a late-night – or even all-night – study of Torah and Jewish texts that commemorates receiving the Torah at Mount Sinai.
Z’man Matan Torateinu
Literally, “the time of the giving of our Torah.” This refers to the holiday of Shavuot.
Esther
Hero of the Purim story. A young Jewish girl living in the capital city, Shushan, she is chosen by King Ahashverosh to be his new queen. She doesn’t tell him, however, that she is Jewish.
Haman
The king’s vizier (adviser), a main character in the Purim story. Haman wants everyone in the kingdom to bow down to him, but Mordechai (a Jew) refuses. This leads Haman to decide to kill all the Jews, and he convinces the king to allow the plan.
matanot la-evyonim
“Presents for the poor” (Hebrew). Tzedakah (charitable giving) in honor of Purim.
Mordechai
A main character of the Purim story, Mordechai was Esther’s cousin, who raised her after her parents died. He saves the king’s life when he overhears a plot against the king.
Arbaah minim
Literally, “four species.” The Torah specifies four species to bring together on Sukkot. The four species are: lulav (branches of palm trees), etrog (citron), hadasim (myrtle branches), and aravot (willows) (Leviticus 23:40).