Please.

American Sign Language:
Please. http://commtechlab.msu.edu/sites/aslweb/P/W2930.htm

English:
Please.

French:
S'il vous plaît. (formal)
S'il te plaît. (informal)

Italian:
Per favore.
Per piacere.

Spanish:
Por favor.

Swahili:
Tafadhali. (to one person)
Tafadhalini. (to more than one person)


To learn the word for "please" in other languages, please visit: http://www.elite.net/~runner/jennifers/please.htm