Av

"The fifth month in the Jewish calendar, it usually corresponds to July or August" (JPS).

avodah

"Service and worship of God" (Eisenberg)

"A unique part of the Musaf service on Yom Kippur, the Avodah prayers describe the sacrificial ritual in the Temple in ancient Jerusalem on the Day of Atonement" (Eisenberg).

"Literally, 'divine service'" (Eisenberg)

work, generally

the name for a unit at camp in which campers help with such duties as service in the dining hall, laundry, etc.

baruch haba

"Welcome!"

beit knesset

Jewish place of worship; "synagogue" (JPS)

Birkat Hamazon

The blessing after food, referring to the four blessing Grace After Meals said after consuming bread. Referred to in many communities as "bentching," or simply as "birkat" in some Jewish summer camps.

chag sameach

"Literally, 'Happy Holiday.' The traditional, all-purpose greeting exchanged on almost any Jewish holiday" (JPS).

genizah

A storage room in a synagogue where disused sacred books and often-sacred articles are kept, since bringing them or disposing of them otherwise is considered a sacrilege.

maccabiah

color war / intra-camp competition in a Jewish summer camp

international Jewish sports competition, known as the Jewish Olympics, held (mostly) every four years since 1932; smaller regional competitions held in Jewish community centers around the world

shomer

adj. observant, observing the laws of kosher, shabbat, or negiya (not touching members of the opposite gender outside of family)

a member of Hashomer Hatzair or a camper or counselor at a Hashomer Hatzair camp

a chaperone, protector, or guard

a camp counselor on duty

one who keeps vigil over a dead body before it is buried

tefillah

prayer, services, or an individual prayer

va'ad

"committee or council" (Steinmetz), group convened for a particular purpose, including rabbinical council, kashrut supervisory council, youth group/synagogue board of directors, study group, etc.